DISTRIBUTION AND RELATIVE ABUNDANCE OF
BLUE CRAB CALLINECTES SAPIDUS IN THE
UPPER BARATARIA ESTUARY, LOUISIANA
A Thesis
Submitted to the Graduate Faculty of
Nicholls State University
In partial fulfillment of the requirements for the degree of
Master of Science
in
Marine and Environmental Biology
by
MattiLynn D. Dantin
B.S., Nicholls State University, 2005
Spring 2007
CERTIFICATE
This is to certify that the thesis entitled “Distribution and Relative Abundance of
blue crab Callinectes sapidus in the Upper Barataria Estuary, Louisiana” submitted for
the award of Master of Science to Nicholls State University is a record of authentic,
original research conducted by Mrs. MattiLynn D. Dantin under our supervision and
guidance and that no part of this thesis has been submitted for the award of any other
degree, diploma, fellowship, or other similar titles.
APPROVED
Quenton Fontenot, Ph.D.
Assistant Professor of
Biological Sciences
Committee Member
Allyse Ferrara, Ph.D.
Assistant Professor of
Biological Sciences
Committee Member
Earl Melancon, Ph.D.
Professor of
Biological Sciences
Committee Member
SIGNATURE
DATE
______________________________
____________
______________________________
____________
______________________________
____________
i
ABSTRACT
Blue crabs Callinectes sapidus are marine organisms that seasonally migrate
within an estuary and contribute to energy transfer throughout the system. Because blue
crab is a commercially and recreationally important species within Louisiana estuaries, it
is important to understand factors that may affect blue crab distribution and abundance.
The Barataria Estuary is bordered by the Mississippi River to the east, Bayou Lafourche
to the west, and the Gulf of Mexico to the south. The upper-most reaches of the Barataria
Estuary are comprised of approximately 41% of forested freshwater wetlands including
the Lac Des Allemands/Bayou Chevreuil area. Blue crabs were sampled weekly between
11 July and 6 December 2006, with modified commercial crab traps at seven fixed sites
in Bayou Chevreuil. Traps were baited with fish carcasses or chicken pieces, and
remained deployed for approximately 24 hours. Surface and bottom water temperature
(°C), salinity (ppt), dissolved oxygen (DO; mg/L) and specific conductance (µs) were
measured at each site when traps were deployed. Blue crab catch per unit effort (CPUE)
was determined as the mean number of crabs collected per trap per day. Crabs were
enumerated and transported to the Bayousphere Research Laboratory to be sexed,
reproductive state determined, and measured for carapace width (mm), carapace length
(mm), cheliped-free body weight (g), and individual cheliped weight (g). Individual trap
CPUE ranged from 0-24 crabs/trap/day. Of the 649 blue crabs collected from Bayou
Chevreuil, there were 24 immature females, 34 mature females, and 591 males. Overall,
females were wider than males, but males were heavier than females of similar width (P
< 0.0001). Temperature, dissolved oxygen, salinity, and specific conductance were
positively correlated (P < 0.05) to blue crab abundance. Distribution and abundance were
ii
highest in July and August and lowest in November and December. Blue crabs are a
seasonally abundant species in Bayou Chevreuil.
iii
ACKNOWLEDGEMENTS
I would like to thank my committee members, Dr. Earl Melancon and Dr. Allyse
Ferrara for their continued support, kindness, and pool of knowledge. Special thanks is
regarded for my major professor, Dr. Quenton Fontenot. He has been my mentor and
friend throughout my graduate experience. The never ending guidance, wisdom, and
patience of my graduate committee has kept me motivated in the pursuit of this degree.
I would like to thank the Nicholls State University Department of Biological
Sciences and the Nicholls State University Bayousphere Research Laboratory for the use
of their vehicles, vessels, and equipment during this endeavor. I would also like to thank
Mr. Joey Toups for donating the crab traps that were used in this study.
Special thanks are held for my family and friends. None of this would have been
possible without the constant love and push by my parents to do better for myself. They
have always supported my decisions for further education and have made themselves
available for whatever tasks that entailed. I thank my siblings and their spouses. They
too were always willing to assist in this undertaking with physical labor and moral
support. I cannot continue without recognition of my graduate professors and fellow
graduate students. They are truly a wonderful group of peers whom every one of them
has helped with the completion of this project. I only wish I could thank everyone by
name. As for my office mates, Olivia Smith and Heather Dyer, I hold great appreciation.
I could always count on these two women, no matter the situation.
The greatest appreciation is held for my husband. He believed in me and my
success when I no longer did. His love and encouragement was my drive and confidence
to accomplish this goal.
iv
TABLE OF CONTENTS
Certificate…………………………………………………………………………………..i
Abstract……………………………………………………………………………………ii
Acknowledgements………………………………………………………………….……iv
Table of Contents…………………………………………………………………….……v
List of Figures…………………………………………………………………………….vi
List of Tables………………………………………………………………………….….ix
List of Scientific Names…………………………………………………………………...x
Introduction……………………………………………………………………….……….1
Methods………………………………………………………………………..…………14
Results……………………………………………………………………………………19
Discussion………………………………………………………………………………..47
Recommendations………………………………………………………………………..54
Literature Cited…………………………………………………………………………..55
Appendix I……………………………………………………………………………….60
Appendix II………………………………………………………………………………76
Appendix III……………………………………………………………………………...83
Biographical Sketch……………………………………………………………………...86
Curriculum Vitae………………………………………………………………………...87
v
LIST OF FIGURES
Figure 1. Location of the Barataria Estuary (gray area) in southeastern Louisiana…...…2
Figure 2. Approximate salinity gradient within the Barataria Estuary based on
data obtained from Braud et al. (2006), LDWLF (2005), and Jaworski
(1972)……………………………………………………………………………...3
Figure 3. Geographic distribution of blue crab. Populations around Europe and
Japan have been introduced and are not native to those areas…………………….7
Figure 4. Sexually dimorphic characteristics of male and female blue crabs.
Illustrated above is the abdominal apron of the male (a), immature female
(b), and mature female (c) blue crab………………………………………………9
Figure 5. Approximate inland most regions occupied by blue crabs in the Barataria
Estuary for each stage of the blue crab life cycle………………………………..13
Figure 6. Bayou Chevreuil and Lac Des Allemands in the Barataria Estuary
(earth.google.com). Location of seven fixed study sites………………………..15
Figure 7. Modified commercial crab trap with closed escape rings…………………….16
Figure 8. Mean (±SD) water temperature in Bayou Chevreuil for all sites combined
for each sample date……………………………………………………………...21
Figure 9. Mean (±SD) water temperature for each site in Bayou Chevreuil for all
sample dates combined from 11 July 2006 to 6 December 2006………………..22
Figure 10. Mean (±SD) dissolved oxygen levels in Bayou Chevreuil for all sites
combined for each sample date. The dashed line represents DO levels at
2.0 mg/L………………………………………………………………………….23
Figure 11. Mean (±SD) overall dissolved oxygen for each site in Bayou Chevreuil
for all sample dates combined from 11 July 2006 to 6 December 2006.
Means with similar letters are not different……………………………………...24
Figure 12. Mean (±SD) salinity in Bayou Chevreuil for all sites combined for each
sample date……………………………………………………………………….25
Figure 13. Mean (±SD) specific conductance in Bayou Chevreuil for all sites
combined for each sample date…………………………………………………..26
Figure 14. Mean (±SD) specific conductance for each site in Bayou Chevreuil for
all sample dates combined from 11 July 2006 to 6 December 2006. Means
with a similar letters are not different……………………………………………27
vi
Figure 15. Size distribution based on carapace width of male and female blue
crabs collected in Bayou Chevreuil from 11 July 2006 to 6 December 2006…...29
Figure 16. Percentage of male, mature female, and immature female blue crabs
collected from Bayou Chevreuil on each sample date from 11 July 2006 to
6 December 2006………………………………………………………………...30
Figure 17. Mean (±SD) width (mm), length (mm), and body weight (g) for male
and female blue crabs collected in Bayou Chevreuil from 11 July 2006 to 6
December 2006. Means within each group that share a common letter are
not different………………………………………………………………………31
Figure 18. Carapace length (a.) and width (b.) as a predictor of cheliped –free
weight for male and female blue crabs in Bayou Chevreuil. There is no
difference between males and females based on length-weight relationship.
Males weighed more than females of similar width (P < 0.0001)……………….32
Figure 19. Carapace width as a predictor of left (a.) and right (b.) cheliped weights
for male female blue crabs in Bayou Chevreuil. Males had larger chelipeds
than females of similar width (P < 0.0001)……………………………………...33
Figure 20. Mean (±SD) condition (K) of male and female blue crabs in Bayou
Chevreuil from 11 July 2006 to 6 December 2006………………………………...34
Figure 21. Mean (±SD) condition (K) of male and female blue crabs for all sites
combined in Bayou Chevreuil for each sample date………………………………35
Figure 22. Mean (±SD) CPUE for each site in Bayou Chevreuil for all sample
dates combined from 11 July 2006 to 6 December 2006. Means with similar
letters are not different…………………………………………………………...36
Figure 23. Mean (±SD) CPUE of blue crabs in Bayou Chevreuil for all sites
combined and the mean (±SD) water temperature for all sites combined
for each sample date. Critical temperature (15 °C) is the water temperature
that blue crabs have been documented to migrate down estuary for the
winter months (Jaworski 1972)…………………………………………………..37
Figure 24. Water temperature (°C) and blue crab CPUE at sites 1 – 7 in Bayou
Chevreuil by sampling date……………………………………………………...39
Figure 25. Mean (±SD) CPUE of blue crabs in Bayou Chevreuil for all sites
combined and the mean (±SD) DO for all sites combined for each sample
date……………………………………………………………………………….40
Figure 26. Mean (±SD) CPUE of blue crabs in Bayou Chevreuil for all sample
vii
dates when DO > 2.0 mg/L was higher than mean CPUE of blue crabs in
Bayou Chevreuil for all sample dates when DO ≤ 2.0 mg/L (P < 0.0039)………41
Figure 27. Dissolved oxygen (mg/L) and blue crab CPUE at sites 1 - 7 in Bayou
Chevreuil by sampling date……………………………………………………...42
Figure 28. Mean (±SD) CPUE of blue crabs in Bayou Chevreuil for all sites
combined and the mean (±SD) salinity for all sites combined for each
sample date……………………………………………………………………….43
Figure 29. Mean (±SD) CPUE of blue crabs in Bayou Chevreuil for all sites
combined and the mean (±SD) specific conductance for all sites combined
for each sample date……………………………………………………………...44
Figure 30. Specific conductance (µS) and blue crab CPUE at sites 1 - 7 in Bayou
Chevreuil by sampling date……………………………………………………...45
Figure 31. Mean (±SD) condition (K) of all blue crabs collected in Bayou Chevreuil
and the mean (±SD) condition of all blue crabs collected in Fourchon/Grand
Isle for each sample date. Circles group saltwater samples with the closest
freshwater samples before and after each saltwater sample. Means with a
similar letter in each group are not different (P < 0.05)…………………………46
viii
LIST OF TABLES
Table 1. Total number of species collected in Bayou Chevreuil from
11 July 2006 to 6 December 2006, using modified commercial crab
traps…………………………………………………….………………………20
ix
LIST OF SCIENTIFIC NAMES
Bald cypress
Taxodium distichum
Tupelo gum
Nyssa aquatica
Blue crab
Callinectes sapidus
Lesser blue crab
Callinectes similis
Black drum
Pogonias cromis
Red drum
Sciaenops ocellatus
Atlantic croaker
Micropogonias undulatus
American eel
Anguilla rostrata
Alligator gar
Lepisosteus spatula
Spotted gar
Lepisosteus oculatus
Channel catfish
Ictalurus punctatus
Blue catfish
Ictalurus furcatus
Gizzard shad
Dorosoma cepedianum
Chicken
Gallus domesticus
Spotted gar
Lepisosteus oculatus
Bluegill
Lepomis macrochirus
White crappie
Pomoxis annularis
Yellow bullhead
Ameiurus natalis
Redear sunfish
Lepomis microlophis
Bowfin
Amia calva
x
INTRODUCTION
Formed approximately 3,500 – 4,000 years ago, the Barataria Estuary is the most
recently abandoned Mississippi River deltaic lobe (LDWLF 2005, Barr and Hebrard
1976). Bordered by the Mississippi River on the east and Bayou Lafourche on the west,
this interconnected hydrologic network extends inland from the Gulf of Mexico for 120
km (Swenson et al. 2006; Jaworski 1972; Figure 1). The Barataria Estuary was
historically connected to the Mississippi River by a series of distributaries and
interdistributaries. The predictable annual spring floods of the Mississippi River would
inundate low-lying areas within the Barataria Estuary with nutrient and sediment rich
water. Many organisms within the Barataria Estuary have adapted to the historic high
water levels associated with the annual Mississippi River spring floods for spawning and
foraging. High water levels coupled with increasing temperature may be an important
cue for many organisms to move onto the floodplain for spawning (Snedden et al. 1999;
Sparks 1995).
The Barataria Estuary is characterized by forested wetlands (11.7%), fresh marsh
(10.2%), intermediate marsh (4.2%), brackish marsh (3.9%), saline marsh (7.2%), and
open saline waters of the Gulf of Mexico along a continuous hydrologic and salinity
gradient (Braud et al. 2006; Figure 2). Approximately 42.5% of the Barataria Estuary is
water (Braud et al. 2006). Local flora and fauna of these regions have adapted to periodic
flooding. The upper-most reaches of the Barataria Estuary (east of Lac Des Allemands)
are approximately 41% forested wetlands (swamps), 38% agricultural lands, and include
a number of bayous and canals (Braud et al. 2006). Salinities in these waters rarely
exceed 1.0 ppt. Dominated by alluvial clay soils, woody vegetation, and high levels of
1
Figure 1. Location of the Barataria Estuary (gray area) in southeastern Louisiana.
2
Figure 2. Approximate salinity gradient within the Barataria Estuary based on data
obtained from Braud et al. (2006), LDWLF (2005), and Jaworski (1972).
3
primary production, the swamp forest connects with fresh marsh south of Lac Des
Allemands (Barr and Hebrard 1976). Fresh marshes are characterized by salinities less
than 2.0 ppt (LDWLF 2005) and non-woody vegetation that is adapted to saturated soils.
High levels of terrestrial primary production are because of fertile soils comprised of
partially decomposed organic matter. The fresh marsh of the Barataria Estuary has
greater wildlife diversity as compared to other marsh habitats (LDWLF 2005). The fresh
marsh connects with intermediate marsh south of Lake Salvador. Intermediate marsh is
characterized by an irregular tidal and salinity regime with a salinity range of 2.0 – 10.0
ppt (Braud et al. 2006; LDWLF 2005). The diversity of species in intermediate marsh
derives from an overlap of organisms common to surrounding fresh and brackish
marshes. Brackish marshes connect intermediate marsh with saline environments and are
the inland most units that are strongly influenced by tidal actions (Barr and Hebrard
1976). Salinities in brackish marsh range from 10.0 – 18.0 ppt (Swenson and Turner
1998; Jaworski 1972). The brackish marsh of the Barataria Estuary exhibits high
biodiversity, especially in larval forms of marine organisms. The saline marsh of the
Barataria Estuary extends inland from the Gulf of Mexico about 30 km and is the habitat
most influenced by diurnal tidal variation (Jones et al. 2002). Soils are predominately
sand and yield the lowest number of plant species; however, saline marshes are primary
nursery grounds for numerous marine organisms (Heck et al. 2001). Saline marshes end
where the open ocean begins and can have salinities up to 30 ppt, whereas the coastal
waters of the Gulf of Mexico can reach 40 ppt (Jaworski 1972). Weather fronts and
storms affect the flux of salinity in the Barataria system as heavy rainfall pushes the
salinity gradient southward and periods of drought drive the salinity gradient northward
4
(Melancon et al. 1998; Swenson and Turner 1998). The relative area of land mass of the
Barataria system decreases from the upper estuary to the open waters of the Gulf of
Mexico, as the salinity increases.
Bayou Lafourche and other distributaries were cut off from the Mississippi River
and the annual Mississippi River flood pulse in order to prevent flooding in the Barataria
Estuary. Without the connection to the annual spring floods of the Mississippi River,
freshwater input into the estuary is primarily through local precipitation. Yet, with the
escalating problem of coastal erosion and saltwater intrusion, Louisiana authorities have
implemented several freshwater diversion projects, one of which is located in the
Barataria Estuary. The Davis Pond freshwater diversion structure was designed to
convey water through the Mississippi River’s west containment levee (Swenson et al.
2006). Nutrient and sediment rich Mississippi River water is diverted through a holding
pond, which drains into Lake Cataouache, and then south to the Gulf of Mexico through
the mid and lower Barataria Estuary (Swenson et al. 2006).
The main open water body in the upper Barataria Estuary is Lac Des Allemands.
This 486 ha flat-bottom lake lies west of New Orleans, Louisiana. With its southeasterly
flow, Bayou Chevreuil weaves across the upper Barataria Estuary and empties into Lac
Des Allemands. Ninety percent of the low-lying cypress-tupelo (Taxodium distichum,
Nyssa aquatica) swamps that surround Bayou Chevreuil drain directly into the bayou
during rains and high water periods (Day et al. 1976) carrying along leaf litter and other
organic materials that serve as an important food source for many aquatic organisms,
including blue crab Callinectes sapidus.
5
The blue crab is a member of the decapod family Portunidae, the swimming
crabs, which contain 300 extant species (Guillory et al. 2001). Swimming crabs are
identified by their most posterior pair of walking legs that have evolved to form
swimming paddles for better mobility throughout the water column. Blue crab is one of
only two species of swimming crabs found in Louisiana and is identified by four carapace
ridges between the eyes. The other swimming crab C. similis has six carapace ridges
between the eyes (Jaworski 1972). Blue crabs are blue to gray in color with a somewhat
convex carapace that is approximately 2.5 times wider than it is long (Meinkoth 1981).
Blue crabs are classified as detritivores, omnivores, and cannibals; eating everything
from decaying fish flesh, to clams and submerged aquatic vegetation, and even smaller
individuals of their own kind, making them an important organism for nutrient cycling
and energy transfer within an ecosystem (Fitz and Weigert 1991; Laughlin 1982; Darnell
1961).
Blue crabs have a large geographic distribution. Blue crabs are abundant
throughout the Gulf of Mexico and along the Atlantic coast as far north as Nova Scotia
and south as far as northern Argentina (Van Engel 1958). Blue crabs have also been
introduced into coastal waters of Europe, the Mediterranean, and Japan (Van Engel 1958;
Figure 3). Blue crabs support a large commercial and recreational fishery and are an
economically important organism within the Barataria Estuary (Guillory et al. 2001).
A study by Tagatz (1969) indicated that blue crabs can increase their tolerance to
temperature changes with an increased acclimation period. Tagatz (1969) tested blue
crabs at 0 °C with different acclimation times ranging from 3 – 21 days, and found that
blue crab survival increased with increased acclimation time. However, significant
6
Figure 3. Geographic distribution of blue crab. Populations around Europe and Japan
have been introduced and are not native to those areas.
7
mortality occurs if blue crabs are exposed to extended periods (≥ 15 days) of water
temperatures below 3 °C (Rome et al. 2005). Blue crabs have very little tolerance for low
temperatures and practice autotomy (sacrificing limbs for survival) at water temperatures
below 5 °C to conserve energy (Rome et al. 2005). Most blue crab activity occurs from
late spring to early fall, but remain dormant and buried in the marsh sediment during the
winter months. Blue crabs vacate lower saline waters of the upper estuary when
temperatures drop to 15 °C to seek out warmer waters near the coast (Jaworski 1972).
With smaller size classes (carapace width (CW) ≤ 30 mm) caught in the winter (15.7 ±
0.19 °C) and the largest size class (CW ≥ 100 mm) caught in the summer (30.1 ± 0.13
°C), Jones et al. (2002) have suggested that juveniles are more tolerant to low
temperatures than are adults.
Blue crabs have sexually dimorphic external physical characteristics (Figure 4).
Mature females have a wide and rounded abdominal apron, while the abdominal apron of
immature females is less rounded and is more triangular in shape (Guillory et al. 2001;
Jaworski 1972; Tagatz 1968; Van Engel 1958). Females also have bright red coloration
on their chelae, or claws. Mature and immature males have the same shape abdominal
aprons, which makes it difficult to determine maturity. Male abdominal aprons are very
slender and tower shaped, and mature males have blue chelae (Guillory et al. 2001;
Jaworski 1972; Tagatz 1968; Van Engel 1958). Immature males will often have a slight
touch of red coloration on the tips of the chelae; however, this is not always a reliable
determination for maturity.
Blue crabs undergo several morphological changes and use different areas of
estuarine systems during their life expectancy of 2 - 4 years. Blue crabs are characterized
8
Figure 4. Sexually dimorphic characteristics of male and female blue crabs. Illustrated
above is the abdominal apron of the male (a), immature female (b), and mature
female (c) blue crab.
9
by discontinuous growth that only occurs during ecdysis (molting; Miller and Smith
2003). The blue crab sheds its exoskeleton during ecdysis to make room for somatic
growth and then takes in water to “puff up” the new shell before it hardens. Juveniles can
increase approximately 14 mm in carapace width per month, and adults can increase 15 20 mm in carapace width per month (Adkins 1972). However, adults molt less frequently
than juveniles due to the greater amount of energy needed by adults for ecdysis. Blue
crabs are often arranged in the following size classes: sub-juveniles (zoeae and
megalops); less than 20 mm CW: juveniles; 20 - 80 mm CW: and adults; greater than 80
mm CW (McClintock et al. 1993; Fitz and Wiegert 1991).
Male blue crabs molt throughout their lifetime, but females experience a limited
number of molts. The final molt of the female blue crab is called the pubertal molt.
Female blue crabs become sexually mature during their pubertal molt (Tagatz 1968; Van
Engel 1958; Churchill 1919). Prior to the pubertal molt, the female blue crab releases
pheromones into the water column to attract a mate (Gleeson 1980). The pheromones
signal that the female has reached maturity, is about to enter her final molt, and is ready
to mate. The attracted male blue crab stays with the female until she molts, at which time
mating occurs during the female’s soft-shell state (Van Engel 1987). The male continues
to guard the female until her shell has hardened and she is less vulnerable to predation.
Because the female only mates during her pubertal molt, the spermatozoa from the single
mating are held for multiple spawnings (Van Engel 1958).
Blue crab mating occurs in the brackish waters of an estuary. After mating,
females migrate down estuary to spawn in higher salinities (Hines 2003; McClintock
1993; Van Engel 1987). A gravid female bearing eggs is commonly referred to as a
10
sponge crab. Her first spawning occurs within 2 - 6 months after mating and she
produces approximately 2 million eggs per sponge (Churchill 1919; Guillory et al. 2001).
The female blue crab carries the eggs for about two weeks and then releases the larvae in
the warm, more saline coastal waters. Water temperatures greater than 19 °C and salinity
greater than 20 ppt are optimal for spawning (Sulkin et al. 1976).
Blue crab larvae go through two stages of development. The first stage is the
zoeal stage (Heck et al. 2001). Starting at 0.25 mm in width, zoeae have very little
physical resemblance to the adult blue crab, and either stay in the coastal bays or move
into the open ocean for further growth and development. They are planktonic consumers
that remain in surface waters for feeding. Like all other stages of the blue crab life cycle,
zoeal growth only occurs during molting. Zoeae undergo 4 - 7 molts over a 30 - 50 day
period (Van Engel 1958). The final molt of the zoeal stage occurs when the zoea are
approximately 1.0 mm wide and transforms from the zoeae into the megalops stage.
Megalopae stay in the nearshore, mesohaline estuarine waters for development, where
they swim freely about feeding near the water column bottom (Tagatz 1968). After 6 20 days and one transforming molt, megalopae enter the juvenile stage (Van Engel 1958).
Early juveniles are approximately 2.5 mm CW and physically resemble adult blue
crabs. Juvenile blue crabs migrate up estuary into lower saline and even fresh waters of
the system, where they continue to grow and mature through a number of molts.
Juveniles reach maturity in the lower salinity estuarine waters after 18 - 20 post-larval
molts at a carapace width greater than 100 mm (Miller and Smith 2003). However, some
juveniles remain in the lower estuary. Maturity is reached 12 - 18 months after larval
release, at which time mating can occur and the females will then migrate down estuary
11
to saline waters for spawning (McClintock et al. 1993). The entire blue crab life cycle
can occur in one estuarine system (Figure 5).
Blue crabs are prey for many organism in saltwater and freshwater habitats
including black drum Pogonias cromis, red drum Sciaenops ocellatus, Atlantic croaker
Micropogonias undulatus, American eel Anguilla rostrata, alligator gar Lepisosteus
spatula, spotted gar Lepisosteus oculatus, channel catfish Ictalurus punctatus, and blue
catfish Ictalurus furcatus (Darnell 1961). In both environments, blue crabs serve as a
connection delivering energy and nutrients from terrestrial sources to aquatic organisms
through the consumption of detrital material. Because blue crabs can be found in fresh
water areas of the upper Barataria Estuary and are an important commercial and
ecological species, the goal of this project was to determine the relative abundance and
distribution of blue crabs in the upper Barataria Estuary, and to describe the size structure
of that population. Water quality parameters were measured to determine the relationship
between water quality and the abundance and distribution of the blue crab population.
Finally, the blue crab population collected from the upper Barataria Estuary was
compared to a population collected from saline waters to determine any sex-based
segregation and differences in condition of the organisms between the two populations.
12
13
Figure 5. Approximate inland most regions occupied by blue crabs in the Barataria Estuary for each stage of
the blue crab life cycle.
METHODS
Field Data Collection
Blue crabs were sampled weekly from 11 July 2006 through 6 December 2006,
from six fixed sites in Bayou Chevreuil and one fixed site in Lac Des Allemands (Figure
6). Although blue crabs were sampled in Lac Des Allemands, the entire sample
population was designated as the Bayou Chevreuil population. Surface and bottom water
temperature (°C), dissolved oxygen (DO; mg/L), salinity (ppt), and specific conductance
(uS) was measured with a hand-held oxygen-conductivity-salinity-temperature meter at
each site for each sample date (Yellow Springs Instruments, Yellow Springs, Ohio). The
mean value for surface and bottom measurements taken for each sample was used for
analysis.
Blue crabs were sampled weekly with modified commercial crab traps (60.9 cm x
60.9 cm x 43.2 cm). Each trap was constructed of vinyl-coated 3.8 cm mesh wire and
two escape rings (5.9 cm inner diameter), which were closed with plastic zip-ties to
prevent escapement of smaller (≤ 127 mm CW) individuals (Figure 7). A polystyrene
buoy, painted red with black lettering for identification, was attached to each trap by 3.66
m of rope. Traps were baited either with gizzard shad Dorosoma cepedianum or chicken
Gallus domesticus pieces. At each of the six sites in Bayou Chevreuil, two traps were set
on each side of the channel, just close enough to the bank to not obstruct boat traffic.
Traps remained deployed for approximately 24 hours. Blue crabs were harvested on the
following day, and the number of blue crabs caught per trap per site was recorded. Once
the blue crabs were removed from the trap and enumerated, they were pooled together by
14
Figure 6. Bayou Chevreuil and Lac Des Allemands in the Barataria Estuary
(earth.google.com). Seven fixed study sites were located by GPS coordinates.
Site 1: 29°53’36.0” N, 90°36’21.3” W; Site 2: 29°53’27.1” N, 90°36’47.2” W;
Site 3: 29°53’34.4” N, 90°38’22.9” W; Site 4: 29°53’25.6” N, 90°39’15.8” W;
Site 5: 29°53’56.9” N, 90°41’17.6” W; Site 6: 29°54’8.6” N, 90°43’1.4” W;
Site 7: 29°55’45.1” N, 90°44’45.7” W.
15
Figure 7. Modified commercial crab trap with closed escape rings.
16
site and placed in an ice bath for transport to the Bayousphere Research Laboratory at
Nicholls State University. Site specific blue crab catch per unit effort (CPUE) was
determined as the mean number of crabs collected per trap per day.
Laboratory Data Collection
Each crab was sexed and females were designated as mature or immature based
on the shape of the abdomen apron (Figure 4). Carapace width (mm) was determined as
the distance between the two outermost lateral spines. Carapace length (mm) was
determined as the distance from the anterior of the carapace to the posterior of the
carapace centered between the two outermost lateral spines. Total weight (g) of each
crab was taken before detaching the chelipeds. Then the weight (g) of both the left and
right cheliped and the cheliped-free body weight (g) was measured separately.
Saltwater Comparison
Blue crabs were sampled from Fourchon and Grand Isle, Louisiana, then sexed,
measured, and weighed with the same methods as used for the Bayou Chevreuil
population on three separate sampling events. These sampling dates included one 24hour duration on 18 July 2006, 19 August 2006, and 17 November 2006. Condition of
the saltwater population was compared to the Bayou Chevreuil population from the
closest dates of Bayou Chevreuil sampling before and after each saltwater sampling.
Statistical Analysis
Water quality was assessed temporally and spatially. First, mean water quality
values for all sites combined for each sample date were calculated to describe water
quality over time. Second, site specific mean values were calculated for all sample dates
combined to compare water quality among sites using analysis of variance.
17
The relationship between blue crab CPUE for all sites combined for each sample
date and mean temperature, DO, salinity, and specific conductance for all sites combined
for each sample date in Bayou Chevreuil was determined with regression analysis.
Analysis of variance was used to compare the mean length, width, and chelipedfree body weight for male and female blue crabs. Regression analysis was used to
determine sex-specific width-weight and length-weight relationships, and analysis of
covariance was used to compare growth between male and female blue crabs in Bayou
Chevreuil. Analysis of covariance was used to compare cheliped weight between male
and female blue crabs collected from Bayou Chevreuil. Because blue crabs can
regenerate lost chelipeds, we did not include chelipeds that were obviously being
regenerated (based on size) when we compared cheliped size between males and females
with regression analysis. Condition for the freshwater (Bayou Chevreuil) and saltwater
(Fourchon/Grand Isle) blue crabs were calculated using the cheliped-free body weight
and carapace length as:
Weight/Length3 x 1000
Analysis of variance was used to compare differences in condition indices of the
freshwater and saltwater blue crabs. All inferences were made based on alpha = 0.05 and
all analyses were performed on log-transformed data.
18
RESULTS
Field Data
A total of 649 blue crabs were collected from 11 July 2006 to 7 November 2006,
in Bayou Chevreuil. In addition to blue crab, 6 fish species were collected in the crab
traps in Bayou Chevreuil (Table 1). Individual water temperature measurements ranged
from 9.4 - 35.3°C and averaged 25.7 ± 6.8 °C. Mean water temperature for all sites
combined declined as the sampling period progressed (Figure 8). Mean water
temperature did not vary among sample sites (Figure 9). Individual DO measurements
ranged from 0.08 - 8.26 mg/L and averaged 3.06 ± 1.21 mg/L. There was no trend in DO
levels among the sampling dates for all sites combined in Bayou Chevreuil (Figure 10).
Mean DO was greatest at site 1 compared to all other sites for all sample dates combined
(Figure 11). Individual salinity measurements ranged from 0.1 - 1.0 ppt and averaged 0.3
± 0.2 ppt. With the exception of 11 October 2006 and 18 October 2006, salinity
remained fairly constant among sample dates (Figure 12). Individual specific
conductance measurements ranged from 114.7 – 1968.5 µS and averaged 630.1 ± 537.4
µS. With the exception of 11 October 2006 and 18 October 2006, specific conductance
remained fairly constant throughout the sampling period (Figure 13). Mean specific
conductance for all sites combined was greatest at site 1 (Figure 14).
A total of 275 blue crabs were collected from saltwater areas on the sampling
dates of 18 July 2006, 19 August 2006, and 17 November 2006, in Fourchon and Grand
Isle. Water temperature for the three sample dates averaged 27.4 ± 6.8 °C and salinity
averaged 28.3 ± 2.6 ppt. Dissolved oxygen was not measured at the saltwater sites.
19
Table 1. Total number of individuals of each species collected in Bayou Chevreuil from
11 July 2006 to 6 December 2006, using modified commercial crab traps.
Species
Callinectes sapidus
Common Name
Blue Crab
Lepisosteus oculatus
Spotted Gar
10
Lepomis macrochirus
Bluegill
10
Pomoxis annularis
White Crappie
5
Ameiurus natalis
Yellow Bullhead
4
Lepomis microlophis
Redear Sunfish
4
Amia calva
Bowfin
1
Total
Number
649
683
20
Mean Temperature ( °C)
35
30
25
20
15
10
5
ov
-N
27
v
No
7-
ct
-O
18
ep
-S
28
p
Se
8-
ug
-A
19
ul
-J
30
ul
-J
10
Date
Figure 8. Mean (±SD) water temperature in Bayou Chevreuil for all sites combined for
each sample date.
21
Temperature ( °C)
35
30
25
20
15
1
2
3
4
5
6
7
Site
Figure 9. Mean (±SD) water temperature for each site in Bayou Chevreuil for all sample
dates combined from 11 July 2006 to 6 December 2006.
22
7
DO (mg/L)
6
5
4
3
2
1
0
ov
N
ov
-N
27
7-
ct
ep
-S
-O
18
28
ug
-A
p
Se
8-
19
ul
-J
ul
-J
30
10
Date
Figure 10. Mean (±SD) dissolved oxygen levels in Bayou Chevreuil for all sites
combined for each sample date. The dashed line represents DO levels at 2.0
mg/L.
23
8
Mean DO (mg/L)
a
6
4
b
b
b
b
b
b
2
0
1
2
3
4
5
6
7
Site
Figure 11. Mean (±SD) overall dissolved oxygen for each site in Bayou Chevreuil for all
sample dates combined from 11 July 2006 to 6 December 2006. Means with
similar letters are not different.
24
1.2
1.0
Salinity (ppt)
0.8
0.6
0.4
0.2
0.0
10
-J
u
30
l
-J
u
19
l
-A
ug
8-
28
Se
p
-S
ep
18
-O
ct
7No
v
27
-N
ov
Date
Figure 12. Mean (±SD) salinity in Bayou Chevreuil for all sites combined for each
sample date.
25
Mean Conductance (uS)
2500
2000
1500
1000
500
0
ov
-N
27
ct
-O
p
v
No
7-
18
e
-S
28
ug
-A
ul
-J
p
Se
8-
19
30
ul
-J
10
Date
Figure 13. Mean (±SD) specific conductance in Bayou Chevreuil for all sites combined
for each sample date.
26
Mean Conductance (uS)
2000
a
1500
1000
b
b
b
b
b
500
b
0
1
2
3
4
5
6
7
Site
Figure 14. Mean (±SD) specific conductance for each site in Bayou Chevreuil for all
sample dates combined from 11 July 2006 to 6 December 2006. Means with a
similar letters are not different.
27
Data Collection
Bayou Chevreuil blue crabs ranged from 80 - 209 mm in carapace width (Figure
15). More males (N=591) were collected than females (mature N = 34; immature
N = 24) in Bayou Chevreuil (Figure 16). The overall sex ratio of males to females
(mature and immature combined) was 10.2:1.
Basing all analyses on log-transformed data, there was no difference in mean
length or mean cheliped-free body weight between male and female blue crabs (Figure
17). However, mean width for females was greater than mean width for male blue crabs
(Figure 17). Length and width were accurate measurements for predicting cheliped-free
weights of both male and female blue crabs in Bayou Chevreuil (Figure 18). Based on
the length-weight relationship, there was no difference in weight for similar sized male
and female blue crabs. Based on the width-weight relationship, males weighed more than
similar sized females (P < 0.0001; Figure 18). Males also had larger chelipeds than
females based on width-cheliped weight relationships (P < 0.0001; Figure 19). There
was no difference in mean condition between male and female blue crabs (Figure 20).
There was also no apparent trend in condition index throughout the study period for
Bayou Chevreuil blue crabs (Figure 21).
Overall, blue crab CPUE was greatest in July and August and decreased from
September through November. Blue crab CPUE was greater at downstream sites than at
upstream sites (Figure 22). Blue crab CPUE was positively correlated (P = 0.0009) to
temperature, with a peak in July and August and a steady decline through the cooler
autumn months (Figure 23). Blue crabs were collected from site 1 on more sampling
dates (N = 13) than from the other sites and were collected the fewest times (N = 3) from
28
Male
Female
120
Frequency
100
80
60
40
20
0
80
90
100
110
120
130
140
150
160
170
180
190
200
210
Width (mm)
Figure 15. Size distribution based on carapace width of male and female blue crabs
collected in Bayou Chevreuil from 11 July 2006 to 6 December 2006.
29
Male
Female
Immature Female
100%
Percent
80%
60%
40%
20%
0%
v
No
7-
ct
-O
18
ep
-S
28
p
Se
8-
ug
-A
19
ul
-J
30
ul
-J
10
Date
Figure 16. Percentage of male, mature female, and immature female blue crabs collected
from Bayou Chevreuil on each sample date from 11 July 2006 to 6 December
2006.
30
Male
Female
180
mm or g
150
b
a
a
120
a
90
a
60
a
30
0
Width
Length
Body wt
Figure 17. Mean (±SD) width (mm), length (mm), and body weight (g) for male and
female blue crabs collected in Bayou Chevreuil from 11 July 2006 to 6 December
2006. Means within each group that share a common letter are not different.
31
Male
Female
2
Female R = 0.9241
2
Male R = 0.9203
6
5.5
ln Weight
5
4.5
4
3.5
3
3.6
3.7
3.8
3.9
4
4.1
4.2
4.3
4.4
4.5
4.6
ln Length
Male
Female
2
2
Male R = 0.9284
6
Female R = 0.9405
ln Weight
5.5
5
4.5
4
3.5
3
4.3
4.5
4.7
4.9
5.1
5.3
ln Width
Figure 18. Carapace length (a.) and width (b.) as a predictor of cheliped –free weight for
male and female blue crabs in Bayou Chevreuil. There is no difference between
males and females based on length-weight relationship. Males weighed more
than females of similar width (P < 0.0001).
32
5.5
Male
Female
2
2
4.5
Female R = 0.7628
Male R = 0.7987
ln Left Cheliped WT
4
3.5
3
2.5
2
1.5
1
3.8
3.9
4
4.1
4.2
4.3
4.4
4.5
ln Length
Male
Female
2
ln Right Cheliped WT
2
Male R = 0.7905
4.5
Female R = 0.7546
4
3.5
3
2.5
2
1.5
1
3.8
3.9
4
4.1
4.2
4.3
4.4
ln Length
Figure 19. Carapace width as a predictor of left (a.) and right (b.) cheliped weights for
male female blue crabs in Bayou Chevreuil. Males had larger chelipeds than
females of similar width (P < 0.0001).
33
4.5
Mean Condition
0.45
0.44
0.43
0.42
0.41
0.4
0.39
0.38
Male
Female
Figure 20. Mean (±SD) condition of male and female blue crabs in Bayou Chevreuil
from 11 July 2006 to 6 December 2006.
34
Mean Male K
Mean Female K
Mean Condition (K)
0.55
0.5
0.45
0.4
0.35
0.3
ct
O
ct
O
ov
-N
19
30
10
p
Se
g
Au
g
Au
20
31
11
l
Ju
ul
22
J
2-
Date
Figure 21. Mean (±SD) condition (K) of male and female blue crabs for all sites
combined in Bayou Chevreuil for each sample date.
35
6
Mean CPUE
5
4
a
3
ab
abc
2
abc
abc
bc
1
c
0
1
2
3
4
5
6
7
Site
Figure 22. Mean (±SD) CPUE for each site in Bayou Chevreuil for all sample dates
combined from 11 July 2006 to 6 December 2006. Means with similar letters are
not different.
36
CPUE
Temp
Temp = 15 °C
6
35
Mean CPUE
4
25
20
2
15
0
MeanTemperature (°C)
30
10
10
-J
u
l
30
-J
u
l
19
-A
ug
8-
28
-S
ep
Se
p
18
-O
ct
7-
No
v
27
-N
ov
Date
Figure 23. Mean (±SD) CPUE of blue crabs in Bayou Chevreuil for all sites combined
and the mean (±SD) water temperature for all sites combined for each sample
date. Critical temperature (15 °C) is the water temperature that blue crabs have
been documented to migrate down estuary for the winter months (Jaworski 1972).
37
site 7 (Figure 24). There is weak positive correlation (P = 0.0500) between blue crab
CPUE and DO in Bayou Chevreuil (Figure 25). Blue crab CPUE was greater for samples
taken when DO > 2.0 mg/L than for samples taken when DO ≤ 2.0 mg/L (P < 0.0039;
Figure 26). Blue crab CPUE was affected by the increase in DO at the upstream sites in
October. Site 1 never had a recorded DO ≤ 2.0 mg/L and was the site with the greatest
number of blue crabs caught, while all other sites experienced several hypoxic events
(Figure 27). Salinity never exceeded 1.0 ppt and was not related to blue crab CPUE in
Bayou Chevreuil (Figure 28). There was no detectable relationship between specific
conductance and blue crab CPUE (Figure 29). Specific conductance fluctuated most at
the downstream sites (sites 1 -4) and except for one event, did not vary much at the
upstream sites (Figure 30). Upstream blue crab CPUE was affected by the October
increase in specific conductance (Figure 30).
Saltwater Comparison
More females (N=159) were collected than males (N=116) in Fourchon and
Grand Isle. The overall sex ratio of males to females was 1:1.4. Blue crabs sampled
from Fourchon and Grand Isle had an approximate 12% higher condition than those
sampled from Bayou Chevreuil during July and August (Figure 31). However, there was
no difference between the condition of the freshwater and saltwater blue crabs for the
November sampling period (Figure 31).
38
Site 1
Temp
Temp = 15
Site 2
CPUE
40
Temp = 15
30
7
40
5
3
2
10
0
30
5
4
20
3
2
10
1
0
0
0
ov
-N
27
v
No
7-
ct
-O
18
Temp
ep
-S
28
p
Se
8-
ug
-A
19
ul
-J
30
ul
-J
10
ov
-N
27
v
No
7-
ct
-O
18
ep
-S
28
p
Se
8-
ug
-A
19
ul
-J
30
ul
-J
10
Date
Date
Site 3
CPUE
CPUE
Temperature (°C)
6
4
20
1
Temp = 15
CPUE
Site 4
7
5
3
2
10
1
0
Temp = 15
CPUE
0
7
6
5
4
3
2
1
0
30
20
10
0
CPUE
CPU E
4
20
Temp
40
6
30
Temperature (°C)
40
Temperature (°C)
CPUE
7
6
Temperature (°C)
Temp
ov
-N
27
v
No
7-
ct
-O
18
ep
-S
28
p
Se
8-
ug
-A
19
ul
-J
30
ul
-J
10
ov
-N
27
v
No
7-
ct
-O
18
ep
-S
28
p
Se
8-
ug
-A
19
ul
-J
30
ul
-J
10
Date
Date
Temp = 15
Site 6
CPUE
7
6
30
5
4
20
10
3
2
0
1
0
7
6
30
5
4
20
3
2
10
1
0
ov
-N
27
v
No
7-
ct
-O
18
ep
-S
28
p
Se
8-
ug
-A
19
ul
-J
30
ul
-J
10
ov
-N
27
v
No
7-
Date
Temp = 15
CPUE
30
20
10
0
CPUE
7
6
5
4
3
2
1
0
40
Temperature (°C)
CPUE
0
ct
-O
18
ep
-S
28
p
Se
8-
ug
-A
19
ul
-J
30
ul
-J
10
Temp
Temp = 15
40
Date
Site 7
Temp
ov
-N
27
v
No
7-
ct
-O
18
ep
-S
28
p
Se
8-
ug
-A
19
ul
-J
30
ul
-J
10
Date
Figure 24. Water temperature (°C) and blue crab CPUE at sites 1 – 7 in Bayou Chevreuil
by sampling date.
39
CPUE
40
Temperature (°C)
Temp
CPUE
Temperature (°C)
Site 5
DO
DO = 2.0 mg/L
7
7
6
6
5
5
4
4
3
3
2
2
1
1
0
0
Mean DO (mg/L)
Mean CPUE
CPUE
ct
ov
-N
-O
ov
N
27
7-
18
ep
p
-S
Se
28
8-
l
l
ug
-A
u
-J
u
-J
19
30
10
Date
Figure 25. Mean (±SD) CPUE of blue crabs in Bayou Chevreuil for all sites combined
and the mean (±SD) DO for all sites combined for each sample date.
40
4
3.5
Mean CPUE
3
2.5
2
a
1.5
b
1
0.5
0
DO > 2.0 mg/L
DO = 2.0 mg/L
Figure 26. Mean (±SD) CPUE of blue crabs in Bayou Chevreuil for all sample dates
when DO > 2.0 mg/L was higher than mean CPUE of blue crabs in Bayou
Chevreuil for all sample dates when DO ≤ 2.0 mg/L (P < 0.0039).
41
DO
Site 1
DO = 2.0 mg/L
CPUE
DO
Site 2
DO = 2.0 mg/L
CPUE
9
7
4
3
2
1
0
3
6
7
5
4
DO (mg/L)
6
5
6
5
4
4
3
3
2
2
1
1
0
0
2
1
0
Site 4
5
3
2
1
0
DO
DO = 2.0 mg/L
7
9
8
7
6
5
4
3
2
1
0
6
5
4
3
2
1
0
4
3
2
1
0
DO = 2.0 mg/L
CPUE
9
8
7
6
5
4
3
2
1
0
7
6
5
4
3
2
1
0
9
8
7
6
7
6
5
5
3
1
1
0
0
CPUE
4
4
3
2
2
ov
-N
27
ct
v
No
7-
-O
18
ep
-S
28
p
Se
8-
ug
-A
19
ul
-J
30
ul
-J
10
Date
Figure 27. Dissolved oxygen (mg/L) and blue crab CPUE at sites 1 - 7 in Bayou
Chevreuil by sampling date.
42
ov
-N
27
CPUE
v
No
7-
ct
-O
18
ep
-S
28
ug
p
Se
8-
-A
19
ul
-J
30
ul
-J
10
ov
-N
27
v
No
7-
ct
-O
18
ep
-S
28
p
Se
8-
ug
-A
19
ul
-J
30
ul
-J
10
Date
CPUE
5
DO (mg/L)
6
CPUE
DO (mg/L)
ov
DO
Site 6
Date
DO (mg/L)
-N
27
CPUE
7
DO = 2.0 mg/L
v
No
7-
ct
-O
18
Date
9
8
7
6
5
4
3
2
1
0
DO
ep
-S
28
p
Se
8-
ug
-A
19
ul
-J
30
ul
-J
10
ov
-N
27
v
No
7-
ct
-O
18
ep
-S
28
p
Se
8-
ug
-A
19
ul
-J
30
ul
-J
10
Date
DO = 2.0 mg/L
CPUE
CPUE
4
DO (mg/L)
6
CPUE
DO (mg/L)
CPUE
7
Site 7
ov
-N
27
DO = 2.0 mg/L
DO
v
No
7-
Date
9
8
7
6
5
4
3
2
1
0
Site 5
ct
-O
18
DO
ep
-S
28
p
Se
8-
ug
-A
19
ul
-J
30
ul
-J
10
ov
-N
27
v
No
7-
ct
-O
18
ep
-S
28
p
Se
8-
ug
-A
19
ul
-J
30
ul
-J
10
Date
Site 3
CPUE
7
CPUE
DO (mg/L)
8
9
8
7
6
5
CPUE
salinity
7
1.0
Mean CPUE
0.8
5
4
0.6
3
0.4
2
0.2
1
0
Mean Salinity (ppt)
6
0.0
ov
-N
27
v
No
7-
ct
-O
18
ep
-S
28
p
Se
8-
ug
-A
19
ul
-J
30
ul
-J
10
Date
Figure 28. Mean (±SD) CPUE of blue crabs in Bayou Chevreuil for all sites combined
and the mean (±SD) salinity for all sites combined for each sample date.
43
CPUE
COND
7
2500
Mean CPUE
2000
5
4
1500
3
1000
2
500
1
0
Mean Conductance (uS)
6
0
ct
ov
-N
-O
ep
ov
N
27
7-
18
-S
p
Se
28
8-
l
l
ug
-A
u
-J
u
-J
19
30
10
Date
Figure 29. Mean (±SD) CPUE of blue crabs in Bayou Chevreuil for all sites combined
and the mean (±SD) specific conductance for all sites combined for each sample
date.
44
COND
Site 1
CPUE
2500
5
1000
3
2
500
1
0
7
6
2000
5
1500
4
1000
3
2
500
0
1
0
0
1
Specific Conductance
(uS)
Specific Conductance
(uS)
2
500
7
6
2000
5
1500
4
1000
3
2
500
1
0
0
CPUE
3
0
27
ov
ct
v
No
N
7-
-O
18
ep
-S
28
p
Se
8-
ug
-A
19
ul
-J
30
ul
-J
10
ov
-N
27
v
No
7-
ct
-O
18
ep
-S
28
p
Se
8-
ug
-A
19
ul
-J
30
ul
-J
10
Date
Date
CPUE
COND
Site 6
2500
4
1000
3
2
500
1
0
7
6
5
4
3
2
1
0
2000
1500
1000
500
0
0
CPUE
2500
7
6
2000
5
4
1000
3
2
500
CPUE
1500
1
0
0
ov
-N
27
v
No
7-
ct
-O
18
ep
-S
28
p
Se
8-
ug
-A
19
ul
-J
30
ul
-J
10
Date
Figure 30. Specific conductance (µS) and blue crab CPUE at sites 1 - 7 in Bayou
Chevreuil by sampling date.
45
ov
-N
27
Date
v
No
7-
ct
-O
18
ep
-S
28
p
Se
8-
ug
-A
19
v
No
ul
-J
30
ul
-J
10
27
ct
v
No
7-
-O
18
ep
-S
28
p
Se
8-
ug
-A
19
ul
l
Ju
-J
30
10
Date
CPUE
5
Specific
Conductance (uS)
6
1500
CPUE
2500
7
2000
CPUE
Specific Conductance
(uS)
ov
1000
CPUE
4
0
Specific
Conductance (uS)
-N
27
5
1500
CPUE
2500
6
COND
v
No
COND
Site 4
7
Site 7
7-
CPUE
2000
COND
ct
Date
2500
Site 5
-O
18
p
Se
COND
ep
-S
28
8-
ug
ul
ul
-A
19
-J
30
-J
10
ov
ov
-N
27
N
7-
ct
p
Se
ug
-O
18
ep
-S
28
8-
-A
19
ul
-J
30
ul
-J
10
Date
Site 3
CPUE
4
Specific Conductance
(uS)
6
1500
CPUE
2500
7
2000
CPUE
Specific Conductance
(uS)
COND
Site 2
Freshwater K
Saltwater K
Mean Condition
0.6
a
0.5
b
b
a
b
0.4
a
a
b
0.3
N
7-
ct
ov
-O
18
ep
-S
28
ug
p
Se
8-
-A
19
l
ul
-J
30
u
-J
10
Date
Figure 31. Mean (±SD) condition (K) of all blue crabs collected in Bayou Chevreuil and
the mean (±SD) condition of all blue crabs collected in Fourchon/Grand Isle for
each sample date. Circles group saltwater samples with the closest freshwater
samples before and after each saltwater sample. Means with a similar letter in
each group are not different (P < 0.05).
46
DISCUSSION
The annual floodpulse of unregulated large river systems is predictable, but varies
among river systems according to local precipitation and discharge. During times of high
discharge, well confined channels within large river floodplains overflow onto their
floodplains (Junk et al. 1989). The occasional inundation of the Bayou Chevreuil
floodplain is directly related to local precipitation and is highly unpredictable (Day et al.
1976; Davis 2006). Vegetation and faunal organisms on the floodplain floor that are not
adapted to high waters perish during times of flooding and contribute large amounts of
decaying organic matter to the ecosystem (Vannote et al. 1980). The floodplain provides
a detrital food supply, spawning ground, and shelter for many organisms living in the
main channel that have evolved to use periodically available floodplain habitats (Junk et
al. 1989). Bowfin Amia calva are dependent on the Bayou Chevreuil floodplain for
spawning habitat. In 2005-2006, bowfin in Bayou Chevreuil had a weak spawning event
due to unusually low water during the spawning period (Davis 2006). Water levels
remained low in Bayou Chevreuil, never inundating the surrounding floodplain, and the
bowfin population was unable to reach its preferred spawning ground. Although, blue
crabs have not been documented leaving the main channel and entering the floodplain
during high water, blue crabs may benefit from floodplain detrital food sources and large
woody debris shelters during ecdysis.
Blue crabs may be seasonally abundant in Bayou Chevreuil as they migrate up
estuary during development (Van Engel 1987). Smaller megalops and juveniles are
found in the more saline waters of the coast and adults are found throughout the estuary
as far inland as the swamps. The size distribution of blue crabs in Bayou Chevreuil
47
ranged from 80 – 210 mm CW. Blue crabs less than 80 mm CW may be present in
Bayou Chevreuil but were not collected possibly because the gear used in this study was
size limiting and the mesh size of the traps allowed for the escapement of smaller
individuals (< 80 mm CW). Fewer numbers of large (≥ 180 mm CW) blue crabs may be
due to the large blue crab commercial fishery in the Barataria Estuary. Larger individuals
are more susceptible to being harvested in commercial crab traps and blue crab fisherman
run traps throughout the entire Barataria Estuary. Therefore, this research cannot be
considered a fishery-independent study.
Based on length-weight relationships, similar sized males and females have
similar weights, but based on width-weight relationships, males are heavier than similar
sized females. Olmi and Bishop (1983) found that intermolt males were heavier than
intermolt females of similar size. Millikin et al. (1980) found that both male and female
juveniles from the same gravid female attained similar width and weight at the same rate,
suggesting that only after maturity do males reach greater sizes than females. Cessation
of ecdysis by female blue crabs prohibits females from reaching the same maximum size
as male blue crabs. The greatest differences in weight between male and female blue
crabs collected for this study occurred in the larger individuals. For example, when
comparing blue crabs less than 127 mm CW, males had a mean cheliped-free body
weight of 67.9 ± 14.3 g whereas females had a mean cheliped-free body weight of 69.2 ±
8.0 g; a difference of 1.3 g. When comparing blue crabs of 170 mm CW or greater,
males had a mean cheliped-free body weight of 192.5 ± 26.5 whereas females had a mean
cheliped-free body weight of 156.8 ± 19.3 g; a difference of 35.7 g. Similar to other
crustaceans, male blue crabs have larger chelipeds than similar size females. This may
48
indicate resource competition among males, or the allocation of energy for cheliped
growth rather than egg development. Size at maturity varies within blue crab
populations. The largest immature female collected by Tagatz (1968) had a carapace
width of 177 mm and the smallest mature female had a carapace width of 99 mm. The
largest immature female found in this study was 159 mm CW whereas the smallest
mature female was 117 mm CW (Appendices I and II).
There was no difference in condition factor between male and female blue crabs
collected from Bayou Chevreuil. Atar and Secer (2003) also found condition factor of
male and female blue crabs to be similar. Blue crabs collected from saltwater areas for
this study had a higher condition than blue crabs collected in freshwater during July and
August. This may indicate that blue crabs in freshwater expend more energy for
osmoregulation resulting in lower somatic growth rates than blue crabs from saline water.
Water quality appears to affect the distribution and abundance of the Bayou
Chevreuil blue crab population. Blue crab larvae are released in early spring in lower
estuarine waters. Larvae develop and migrate up estuary. During warm summer months
there is a gradual increase in size towards larger juveniles and adults as the total
population abundance decreases (Fitz and Wiegert 1992). Blue crabs do not acclimate
well to low temperatures with tolerance to low temperatures further reduced at low
salinities (Rome et al. 2005), such as the low salinities found in Bayou Chevreuil. The
blue crab CPUE was correlated to temperature with the highest levels of CPUE in July
and August and a steady decline in CPUE towards the winter months. Surviving blue
crabs seek out warmer waters of the lower estuary to overwinter at which time somatic
growth is halted (Miller and Smith 2003). Once water temperatures dropped to 15 °C in
49
Bayou Chevreuil, blue crabs were either migrating south or burying themselves in the
sediment, but were no longer attracted to the baited crab traps.
Decomposition of organic material in large river floodplains coupled with high
temperatures results in high rates of oxygen consumption leading to hypoxic and anoxic
conditions (Junk et al. 1989). Bayou Chevreuil had occasional hypoxic conditions during
this study with the upstream sites (sites 5, 6, and 7) experiencing more hypoxic events
than did downstream sites (sites 1, 2, and 3). Fetch and lack of shading most likely
explains why DO was greatest at site 1 than any other sites. Site 1, located at the mouth
of Bayou Chevreuil, was in Lac Des Allemands. The open area of the lake allowed for
greater wind and wave action and exposure to sunlight than in Bayou Chevreuil. Bayou
Chevreuil is lined with trees that block wind action and sunlight, thereby decreasing DO
as compared to the DO at site 1. Although tolerance to hypoxic waters increases with an
increase in age, blue crabs are sensitive to low levels of dissolved oxygen (Tankersley
and Wieber 2000; Das and Stickle 1993). Bell et al. (2003a) observed telemetered blue
crabs swimming near the surface of the water column or moving completely out of an
area in an attempt to escape hypoxic conditions. The abundance of blue crabs in Bayou
Chevreuil appears to be affected by dissolved oxygen levels as fewer individuals were
collected at DO levels ≤ 2.0 mg/L than at DO levels > 2.0 mg/L. Also, there is a weak
positive relationship between DO and CPUE. The increase in CPUE at sites 3 – 7 on 11
October 2006, appears to be related to DO levels increasing above hypoxic levels.
Prolonged exposure to hypoxia is lethal (Tankersley and Wieber 2000), and sites
in Bayou Chevreuil where DO remained at or below 2.0 mg/L for at least two
consecutive weeks, blue crab CPUE was near zero. A decline in feeding and molting
50
rates of blue crab occurs during hypoxic events (Bell et al. 2003b; Seitz et al. 2003b; Das
and Stickle 1993); indicating that in hypoxic waters, blue crabs are not attracted to baited
traps. The resulting decline in CPUE in Bayou Chevreuil during hypoxic events supports
the claim that low oxygen levels are detrimental to blue crab growth (Mistiaen et al.
2003; Hines 2003).
Blue crabs in Bayou Chevreuil must be tolerant of low DO because the lowest DO
recorded when at least one blue crab was collected was 0.69 mg/L (25 October 2006;
Appendix III). The highest site specific CPUE of 6.5 crabs per trap per day occurred
once when DO was 7.5 mg/L and once when DO was 1.4 mg/L (11 July 2006 and 11
August 2006; Appendix III). As a result, it cannot be determined if the increase in blue
crab relative abundance around 11 October 2006, was a response to an increase in DO or
an increase in specific conductance or to both. There was no appreciable change in water
temperature on 11 October 2006, therefore the increase in blue crab CPUE was not
temperature related.
Blue crabs sampled from Bayou Chevreuil (freshwater) were predominately
males (91 %) while blue crabs sampled from Fourchon and Grand Isle (saltwater) were
predominately females (58 %). A possible explanation for this sex-based segregation is
that females migrate towards the coast after maturation to spawn in saline waters (Hines
2003; McClintock et al. 1993; Van Engel 1987; Adkins 1972). Another possible
explanation is the difference in osmotic regulation between male and female blue crabs.
Osmotic regulation demands are greater at low salinities (≤ 8.0 ppt), and are associated
with greater energy expenditure (Rome et al. 2005). Low salinities (2.0 ppt) cause
osmotic regulation demands to be greater for females than males, and greatest for
51
ovigerous females (Tagatz 1971; Tan and Van Engel 1966). Additionally, oxygen
consumption increases with decreasing ambient salinity (Findley et al. 1978). The
combination of low salinity (≤ 1.0 ppt) and low dissolved oxygen (overall mean DO =
3.05 ± 1.76 mg/L) and the resulting increased oxygen demand may prevent migration of
female blue crabs into Bayou Chevreuil. However, there are benefits to living in low
salinities for blue crabs. Water uptake during molting is greater in low salinity waters
than in high salinity waters, resulting in higher blood volume, which may shorten the
time required to complete ecdysis, thus reducing vulnerability to predation (de Fur 1990).
Because of warmer temperatures, predation on blue crabs is greater in the United States
Gulf of Mexico than along the Atlantic coast (Heck and Coen 1995). Estuarine waters
with low DO and low salinity, such as the upper Barataria Estuary, may serve as a refuge
for blue crabs from larger predatory organisms that cannot withstand such conditions.
Seasonal abundance of blue crabs in the upper Barataria Estuary is dictated by
water quality. Based on field observations and blue crab fishermen testimonies, Jaworski
(1972) designated the southern portion of Lac Des Allemands to be the most northern
maturation grounds for blue crabs in the Barataria Estuary, but this study provides
evidence that male and a few female blue crabs can use the Bayou Chevreuil region as
maturation grounds. However, the Barataria Estuary had a drought year in 2006,
resulting in higher salinities throughout the estuary, possibly pushing blue crabs further
up estuary than normal. It is unknown whether blue crabs would be as abundant in
Bayou Chevreuil during a wet or even average rain year.
Typically, the movement of energy is believed to flow down estuary in the forms
of primary production and detritus or through nutrient loading (Vannote et al. 1980).
52
These nutrients are utilized by organisms throughout the estuary during the southward
flow to the Gulf of Mexico. However, nutrients in saline waters are made available to
organisms upstream in freshwater systems through nutrient cycling by blue crabs. Blue
crabs consume energy in the Gulf of Mexico, migrate up estuary, and are consumed by
various predators throughout their northward migration. This study indicates that blue
crabs may be an important vector in the up estuary movement of energy and nutrients
providing a seasonal food supply for resident freshwater organisms of the upper Barataria
Estuary.
53
RECOMMENDATIONS
Restoring a seasonal floodpulse in the upper Barataria Estuary would allow for
predictable high waters to inundate the Bayou Chevreuil floodplain. High water levels
would flush stagnant swamp waters and increase dissolved oxygen levels throughout the
water system. An increase in detritus would also provide a greater food supply for
resident and migratory organisms.
To follow up on this study, blue crab sampling should take place for at least one
full year to cover all seasonal changes. If possible, sampling should occur for
consecutive years to provide data on whether wet and dry years result in different relative
abundance of blue crabs in Bayou Chevreuil. Samples should also be taken from the
backwater areas during periods of inundation to determine if blue crabs utilize the
increased habitat for foraging. Additional funding would allow for the purchase of
smaller mesh cages to determine if the size distribution of blue crabs from this study was
due to gear bias or the absence of small juveniles in Bayou Chevreuil.
54
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59
APPENDIX I
Appendix I. Raw data for blue crabs collected from 11 July 2006 to 7 November 2006,
from Bayou Chevreuil/Lac Des Allemands with collection date, collection site, carapace
width (mm), carapace length (mm), cheliped-free body weight (g), left cheliped weight
(g), right cheliped weight (g), total body weight (g), and sex in the upper Barataria
Estuary. CW=Carapace width, CL=Carapace length, Bwt=Cheliped-free body weight,
Lwt=Left cheliped weight, Rwt=Right cheliped weight, Twt=Total body weight.
Date
Site
CW
CL
Bwt
Lwt
Rwt
Twt
Sex
11-Jul-06
11-Jul-06
11-Jul-06
11-Jul-06
11-Jul-06
11-Jul-06
11-Jul-06
11-Jul-06
11-Jul-06
11-Jul-06
11-Jul-06
11-Jul-06
11-Jul-06
11-Jul-06
11-Jul-06
11-Jul-06
11-Jul-06
11-Jul-06
11-Jul-06
11-Jul-06
11-Jul-06
11-Jul-06
11-Jul-06
11-Jul-06
11-Jul-06
11-Jul-06
11-Jul-06
11-Jul-06
11-Jul-06
11-Jul-06
11-Jul-06
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
2
2
2
2
2
117
120
128
135
139
133
143
135
130
139
153
155
147
143
167
148
146
154
156
152
157
156
157
162
175
178
116
102
110
142
137
55
55
55
60
63
60
61
63
61
66
70
63
66
65
70
68
68
67
70
69
67
70
75
72
75
77
50
50
50
60
61
68.58
66.89
86.85
96.5
95.57
93.17
105.91
100
101
114
123
116.5
124
126
140.5
127.5
136
125.5
127.5
142.5
153
146
161.5
166
169.5
195.5
63.1
46.18
58
94
106
8.69
11.19
10.46
.
10.86
12.87
.
12.95
13.87
18.18
11.59
18.55
18.75
20.36
14.96
21.59
20.43
23.99
26.63
26.04
23.02
28.09
24.67
27.42
29.38
31.27
.
6.57
7.51
11.06
8.77
8.97
11.85
11.79
14.68
11.59
14.75
16.03
14.88
17.25
17.11
17.3
20.53
12.93
23.42
16.18
23.71
15.16
26.46
27.23
27.92
28.39
30.02
28.98
28.54
35.25
32.79
.
7.1
7.99
7.41
15.26
86.79
90.08
109.43
111.5
118.71
121.2
122.13
128
132
150
152.5
155.5
156
170
172.5
173
175
176.5
181.36
196.5
204.5
205.5
215.5
222
234.5
259.5
63.1
69.97
73.66
112.5
130.5
m
m
m
m
m
m
m
m
m
m
f
m
m
m
f
m
m
m
m
m
m
m
m
m
m
m
m
m
m
f
m
60
Date
Site
CW
CL
Bwt
Lwt
Rwt
Twt
Sex
11-Jul-06
11-Jul-06
11-Jul-06
11-Jul-06
11-Jul-06
11-Jul-06
11-Jul-06
11-Jul-06
11-Jul-06
11-Jul-06
11-Jul-06
11-Jul-06
11-Jul-06
11-Jul-06
11-Jul-06
11-Jul-06
11-Jul-06
11-Jul-06
11-Jul-06
11-Jul-06
11-Jul-06
11-Jul-06
11-Jul-06
11-Jul-06
11-Jul-06
11-Jul-06
11-Jul-06
11-Jul-06
11-Jul-06
11-Jul-06
11-Jul-06
11-Jul-06
11-Jul-06
11-Jul-06
11-Jul-06
11-Jul-06
11-Jul-06
11-Jul-06
11-Jul-06
11-Jul-06
11-Jul-06
11-Jul-06
2
2
2
2
2
2
2
2
2
3
3
3
3
3
3
3
3
3
3
3
3
3
4
4
4
4
4
4
4
4
4
4
4
4
4
4
5
5
5
5
5
5
158
129
165
154
166
169
155
167
185
105
121
126
138
134
162
163
176
163
176
158
155
167
103
118
129
136
148
142
153
159
154
174
174
176
167
172
126
126
147
145
152
148
67
65
68
70
67
66
67
74
80
52
56
57
60
65
70
68
69
70
65
65
70
71
45
51
57
62
65
64
67
68
65
72
70
72
72
75
59
58
62
64
68
68
134
110.5
118.5
137
136
137
140.5
176
219
55.97
69.84
83.21
88.37
107
122
114.5
143
144
133.5
127
129.5
147.5
43.12
65.68
88.55
108.5
115.5
118.5
119.5
141
135.5
153.5
165.5
153
176.5
166
86.5
88.5
103
115
117
134
.
15.67
13.04
9.73
18.41
17.64
17.62
26.72
40.97
6.46
10.73
10.88
12.53
13.27
17.5
12.7
.
19.86
18.53
21.78
16.57
25.3
.
4.83
10.66
14.97
8.27
16.8
19.59
7.04
17.23
.
.
19.68
25.49
25.58
8.85
12.53
15.05
16.17
17.57
18.03
9.03
15.66
15.17
17.85
20.23
20.65
20.68
29.47
46.51
7.26
7.92
11.68
13.72
16.37
.
13.6
20.01
.
16.14
20.53
24.02
23.14
5.09
8.28
11.46
7.76
13.37
17.82
19.01
14.64
18.59
20.3
22.82
21.79
.
30.61
12.57
13.61
16.71
17.55
16.73
22.97
143
144
147
165
175
175.5
178.5
233
308
69.86
88.24
105.81
114.8
136.5
139
141
163
164
168
170
170
196
48.51
79.05
111
131.5
137.5
153.5
158.5
164
171
174
188.5
194.5
202
223.5
108
115
135
149.5
151.5
175.5
m
m
f
m
f
f
m
m
m
m
m
m
m
m
m
f
f
m
f
m
m
m
m
if
m
m
if
m
m
if
m
f
f
f
m
m
m
m
m
m
m
m
61
Date
Site
CW
CL
Bwt
Lwt
Rwt
Twt
Sex
11-Jul-06
11-Jul-06
11-Jul-06
11-Jul-06
11-Jul-06
11-Jul-06
11-Jul-06
11-Jul-06
11-Jul-06
11-Jul-06
11-Jul-06
11-Jul-06
11-Jul-06
11-Jul-06
11-Jul-06
11-Jul-06
11-Jul-06
11-Jul-06
11-Jul-06
11-Jul-06
11-Jul-06
11-Jul-06
11-Jul-06
11-Jul-06
11-Jul-06
11-Jul-06
11-Jul-06
11-Jul-06
11-Jul-06
11-Jul-06
11-Jul-06
11-Jul-06
11-Jul-06
11-Jul-06
11-Jul-06
11-Jul-06
11-Jul-06
11-Jul-06
27-Jul-06
27-Jul-06
27-Jul-06
27-Jul-06
5
5
5
6
6
6
6
6
6
6
6
6
6
6
6
6
6
6
7
7
7
7
7
7
7
7
7
7
7
7
7
7
7
7
7
7
7
7
1
1
1
1
153
162
170
133
132
140
133
140
147
156
146
159
172
176
175
186
189
198
132
153
150
158
152
158
173
157
165
162
170
155
169
173
172
175
187
183
193
197
115
125
125
134
70
75
73
61
62
60
63
65
67
68
66
67
70
74
77
82
84
86
59
67
68
67
66
68
73
72
70
69
71
70
75
77
80
77
75
80
84
83
52
59
59
61
149.5
161.5
159
88.5
92.5
99
107.5
117.5
118
127
128
135.5
139
180
185
200
237.5
254.5
91.5
131.5
131
148.5
138.5
142
136
144.5
153
143.5
157
157
152
182
191.5
180
189
187
207.5
227.5
60.77
70.5
82
90
24.07
22.35
26.6
11.07
9.9
12.14
16.68
8.31
15.78
21.54
17.85
16.09
15.28
28.58
32.44
33.93
31.32
40.14
12.12
10.19
18.91
22.99
17.05
19.62
24.2
23.13
19.38
23.54
21.16
20.39
25.8
.
.
21.67
26.91
30.43
38.02
46.05
3.94
9.52
9.88
.
20.01
24.34
32.06
11.83
12.29
15.16
17.82
16.38
18.36
6.8
18.19
16.42
19.13
30.01
34.07
28.75
43.69
44.19
14.14
19.67
20.96
.
20.71
21.56
25.73
23.69
18.8
25.07
24.9
26.15
27.46
34.34
32.29
31.47
30.3
32.61
44.58
51.19
4.09
9.05
11.26
13.13
194
208.5
218
111.5
115.5
126.5
142
142.5
153
157.5
164
168.5
173.5
240
252
263
314.5
341
118
161.5
171
171.5
176.5
183
186.5
191
191.5
192.5
203.5
204
206
217
224
234
246
252.5
291
329.5
68.89
89
103.5
104
m
m
m
m
m
m
m
m
m
m
m
f
f
m
m
m
m
m
m
m
m
m
m
m
m
m
m
m
m
m
m
m
m
m
m
m
m
m
m
m
m
m
62
Date
Site
CW
CL
Bwt
Lwt
Rwt
Twt
Sex
27-Jul-06
27-Jul-06
27-Jul-06
27-Jul-06
27-Jul-06
27-Jul-06
27-Jul-06
27-Jul-06
27-Jul-06
27-Jul-06
27-Jul-06
27-Jul-06
27-Jul-06
27-Jul-06
27-Jul-06
27-Jul-06
27-Jul-06
27-Jul-06
27-Jul-06
27-Jul-06
27-Jul-06
27-Jul-06
27-Jul-06
27-Jul-06
27-Jul-06
27-Jul-06
27-Jul-06
27-Jul-06
27-Jul-06
27-Jul-06
27-Jul-06
27-Jul-06
27-Jul-06
27-Jul-06
27-Jul-06
27-Jul-06
27-Jul-06
27-Jul-06
27-Jul-06
27-Jul-06
27-Jul-06
27-Jul-06
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
2
2
2
2
2
2
2
2
2
2
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
132
141
132
136
149
159
145
139
153
153
170
154
154
155
179
156
116
126
126
153
140
151
146
151
158
175
111
116
135
133
137
140
141
166
146
153
166
153
154
150
157
175
59
61
63
65
69
64
65
66
67
71
72
68
70
66
74
67
53
58
60
64
64
66
68
70
70
76
54
51
61
66
68
64
63
66
65
72
68
68
69
68
71
74
91.5
91
99
105.5
123.5
117
110.5
110
119.5
136
141.5
136.5
133
138
162.5
156
62.86
80.5
91
102.5
100
123.5
127
129.5
152
177.5
64
59.83
94.85
94.4
94
104.5
106.5
120.5
178.5
136
126.5
120
128.5
129.5
145.5
169.5
10.92
11.82
12.62
14.45
16.23
9.38
14.51
15.56
17.66
23.7
15.35
19.98
21.06
20.71
16.7
25.54
7.34
11.14
12.26
12.35
13.69
16.14
16.53
16.48
20.18
24.09
8.19
6.09
13.5
4.63
11.53
14.55
14.32
13.25
14.85
.
12.74
17.1
10.27
19.36
17.82
23.57
11.63
12.79
14.34
13.84
.
13.48
16.35
16.04
10.11
13.35
17.35
18.73
20.96
21.78
22.73
29.1
8.22
10.24
11.73
7.2
15.44
.
17.66
17.55
21.52
25.46
.
6.67
.
13.25
12.68
13.95
13.92
13.54
16.01
18.3
15.53
19.28
19.63
19.89
19.44
.
114
116
126.5
135
140
142
142
143.5
156
173.5
174.5
175.5
176
181
204.5
211
79
103
115
125
129.5
140
162.5
165.5
195.5
228.5
72.56
73.12
108.83
115.5
119
133
135.5
149
150
154.5
156.5
157.5
159
169.5
183.5
193
m
m
m
m
m
f
m
m
m
m
f
m
m
m
f
m
m
m
m
f
m
m
m
m
m
m
m
if
m
m
m
m
m
f
m
m
m
m
m
m
m
m
63
Date
Site
CW
CL
Bwt
Lwt
Rwt
Twt
Sex
27-Jul-06
27-Jul-06
27-Jul-06
27-Jul-06
27-Jul-06
27-Jul-06
27-Jul-06
27-Jul-06
27-Jul-06
27-Jul-06
27-Jul-06
27-Jul-06
27-Jul-06
27-Jul-06
27-Jul-06
27-Jul-06
27-Jul-06
27-Jul-06
27-Jul-06
27-Jul-06
27-Jul-06
27-Jul-06
27-Jul-06
27-Jul-06
27-Jul-06
27-Jul-06
27-Jul-06
27-Jul-06
27-Jul-06
4-Aug-06
4-Aug-06
4-Aug-06
4-Aug-06
4-Aug-06
4-Aug-06
4-Aug-06
4-Aug-06
4-Aug-06
4-Aug-06
4-Aug-06
4-Aug-06
4-Aug-06
3
3
3
3
3
4
4
4
4
4
4
4
4
4
4
5
5
5
5
5
5
5
6
6
6
6
6
6
6
1
1
1
1
1
1
1
1
1
1
1
1
1
168
171
170
180
197
140
144
145
164
160
163
175
173
190
200
141
140
150
146
159
175
209
135
166
165
169
176
185
185
117
114
120
128
125
131
137
131
128
137
130
134
146
72
79
79
77
85
66
64
70
74
68
75
72
75
77
84
65
65
69
65
70
75
89
61
70
74
77
80
79
86
48
52
55
59
58
56
56
55
59
62
60
61
62
159
173.5
179
194
230.5
108
106
123.5
152.5
141
143
164.5
168.5
183
249.5
99.5
110
121
134
159
187
270.5
91
126
144
176
181.5
207
228.5
55.85
69.91
68.28
77.91
81.7
81.12
84.94
85.5
90
100
92
97
95.5
31.36
25.78
32.88
29.3
27.83
13.84
13.29
15.25
.
17.89
18.67
22.71
26.45
30.1
.
.
13.37
9.69
17.32
21.99
26.78
48.64
11.31
13.8
20.29
25.83
29.04
33.24
40.15
.
5.88
8.18
.
6.01
9
9.82
11.48
12.61
.
12.53
12.11
11.87
22.83
27.59
35.72
29.19
47.29
7.59
14.09
17.36
21.57
18.92
19.8
24.15
26.05
27.42
43.87
.
.
16.35
18.19
24.25
29.85
51.75
11.45
14.25
20.21
23.01
31.65
36.2
44.15
7.29
8.63
8.93
9.27
9.55
10.11
10.39
11.52
11.91
14.54
12.27
12.75
15.34
216
228.5
248
254.5
323.5
130
133.5
156.5
176
178
183
212
223.5
244.5
293.5
99.5
123.5
148
170
211
245.5
386.5
115
155.5
186
228.5
248.5
277.5
316
63.41
84.89
86.31
87.72
98.21
100.73
105.5
108.5
114.5
114.5
118
122
123.5
m
m
m
m
m
m
m
m
m
m
m
m
m
m
m
m
m
m
m
m
m
m
m
f
m
m
m
m
m
m
m
m
m
if
m
m
m
m
m
m
m
m
64
Date
Site
CW
CL
Bwt
Lwt
Rwt
Twt
Sex
4-Aug-06
4-Aug-06
4-Aug-06
4-Aug-06
4-Aug-06
4-Aug-06
4-Aug-06
4-Aug-06
4-Aug-06
4-Aug-06
4-Aug-06
4-Aug-06
4-Aug-06
4-Aug-06
4-Aug-06
4-Aug-06
4-Aug-06
4-Aug-06
4-Aug-06
4-Aug-06
4-Aug-06
4-Aug-06
4-Aug-06
4-Aug-06
4-Aug-06
4-Aug-06
4-Aug-06
4-Aug-06
4-Aug-06
4-Aug-06
4-Aug-06
4-Aug-06
4-Aug-06
4-Aug-06
4-Aug-06
4-Aug-06
4-Aug-06
4-Aug-06
4-Aug-06
4-Aug-06
4-Aug-06
4-Aug-06
1
1
1
1
1
1
1
1
1
1
1
1
2
2
2
2
2
2
2
2
2
2
2
2
2
2
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
136
140
150
147
145
146
152
160
150
160
164
164
109
144
133
140
147
161
145
145
157
149
154
153
148
151
109
125
122
124
131
135
148
137
147
141
156
155
159
170
167
175
60
62
63
63
66
64
66
67
69
71
71
70
50
63
64
66
65
72
65
65
67
66
65
70
69
64
45
56
61
64
63
62
64
63
64
64
69
67
71
72
72
63
98.5
98.5
108
113
128
132
132
138.5
134
136.5
165
145
60.57
100.5
103
116
126.5
106.5
115.5
117.5
129.5
125
123.5
137
133.5
139
43.75
83.59
96.5
108
105
103.5
106
108.5
114.5
110.5
116.5
129
140.5
151.5
163.5
181
12.05
13.6
14.4
14.62
17.03
16.46
19.89
19.47
22.39
20.37
.
23.82
6.52
.
12.97
15.89
10.88
19.73
15.41
16.03
14.04
17
18.61
17.17
21.03
20.98
4.46
9.31
6.18
13.83
12.96
12.99
13.06
13.98
14.49
16.53
14.44
17.23
19.42
20.37
23.77
25.38
13.7
15.44
15.53
15.27
17.89
19.78
22.34
22.03
23.26
22.34
25.66
22.87
7.29
14.13
14.11
8.85
.
21.28
16.36
16.64
13.87
18.21
19.6
19.09
20.81
20.21
4.49
10.92
12.75
.
12.01
13.78
13.77
14.88
13.61
16.26
16.21
20.27
18.04
22.46
24.85
27.21
124.5
128.5
138
143.5
163.5
168.5
175.5
181
181
182.5
191
192.5
74.9
115
130.5
136.5
138
148
148.5
153
159.5
161
163.5
174.5
176
181
53.01
104.76
116
123
130.5
131
133.5
137.5
143
144
147.5
167.5
179.5
194
213.5
235
m
m
m
m
m
m
m
m
m
m
m
m
m
m
m
m
m
m
m
m
m
m
m
m
m
m
m
m
m
m
m
m
m
m
m
m
m
m
m
m
m
m
65
Date
Site
CW
CL
Bwt
Lwt
Rwt
Twt
Sex
4-Aug-06
4-Aug-06
4-Aug-06
4-Aug-06
4-Aug-06
4-Aug-06
4-Aug-06
4-Aug-06
4-Aug-06
4-Aug-06
4-Aug-06
4-Aug-06
4-Aug-06
4-Aug-06
4-Aug-06
4-Aug-06
4-Aug-06
4-Aug-06
4-Aug-06
4-Aug-06
4-Aug-06
4-Aug-06
4-Aug-06
4-Aug-06
4-Aug-06
4-Aug-06
4-Aug-06
4-Aug-06
4-Aug-06
4-Aug-06
4-Aug-06
4-Aug-06
4-Aug-06
4-Aug-06
4-Aug-06
11-Aug-06
11-Aug-06
11-Aug-06
11-Aug-06
11-Aug-06
11-Aug-06
11-Aug-06
3
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
5
5
5
5
5
5
5
5
5
5
5
5
6
6
6
6
1
1
1
1
1
1
1
192
127
128
147
160
158
145
150
144
142
154
152
169
160
169
160
179
195
193
125
139
141
137
142
144
139
174
164
173
164
170
132
131
168
174
129
126
118
128
136
126
127
82
66
59
68
64
66
65
65
61
66
73
71
71
72
71
73
75
84
82
57
63
61
63
62
64
65
68
75
78
73
78
66
58
69
73
55
59
55
60
59
59
60
229
78.9
99.5
125.5
119
114
116
116.5
118
131
129
143
149
144.5
148.5
157
178
233.5
215
85.84
99
100.5
105
111.5
114
116.5
147
160.5
178
168.5
186.5
76.81
91.75
132
176
71.62
85.59
73.03
83.78
84.08
85.33
88.15
36.07
10.19
7.3
.
12.29
15.36
15.4
18.05
16.35
16.02
16.69
19.53
17.64
20.84
18.55
22.43
22.44
17.54
31.91
7.09
12.67
13.41
12.87
13.07
14.88
14.87
15.6
23.94
22.46
30.5
31.28
10.06
.
15.65
24.18
7.53
10.36
8.67
9.51
10.33
10.61
10.96
37.15
10.99
7.52
17.32
13.53
17.94
16.73
15.64
17.17
17.44
18.42
18.27
15.44
19.67
19.48
24.07
27.97
17.88
34.85
10.82
13.64
14.28
13.82
14.21
16.09
15.74
17.68
24.64
25.32
31.06
31.06
.
11.78
15.6
25.85
.
11.59
9.44
11.08
11.55
12.09
12.98
304
101.14
114.5
143
145.5
147.5
149.5
151
153
165
166
181.5
183
186.5
188
205.5
229.5
270.5
284
104.77
125.5
128.5
132
138.5
145.5
148.5
181
209.5
227.5
234.5
257
87.64
104.29
163.5
227.5
80.23
86.09
92.23
105.38
107.24
112
114.65
m
m
m
m
f
m
m
m
m
m
m
m
f
m
f
m
m
m
m
m
m
m
m
m
m
m
f
m
m
m
m
m
m
f
m
if
m
m
if
if
m
m
66
Date
Site
CW
CL
Bwt
Lwt
Rwt
Twt
Sex
11-Aug-06
11-Aug-06
11-Aug-06
11-Aug-06
11-Aug-06
11-Aug-06
11-Aug-06
11-Aug-06
11-Aug-06
11-Aug-06
11-Aug-06
11-Aug-06
11-Aug-06
11-Aug-06
11-Aug-06
11-Aug-06
11-Aug-06
11-Aug-06
11-Aug-06
11-Aug-06
11-Aug-06
11-Aug-06
11-Aug-06
11-Aug-06
11-Aug-06
11-Aug-06
11-Aug-06
11-Aug-06
11-Aug-06
11-Aug-06
11-Aug-06
11-Aug-06
11-Aug-06
11-Aug-06
11-Aug-06
11-Aug-06
11-Aug-06
11-Aug-06
11-Aug-06
11-Aug-06
11-Aug-06
11-Aug-06
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
3
3
3
3
125
137
135
153
144
150
154
150
153
156
160
156
164
166
175
189
110
104
115
115
118
118
121
132
130
123
136
128
126
131
144
133
142
135
133
145
147
164
116
111
117
117
60
67
62
68
68
64
75
68
67
70
70
71
71
76
75
79
51
53
54
52
56
55
56
62
58
57
61
61
60
61
63
61
65
64
65
65
65
72
51
54
54
56
92
98.73
105
114
128
119
117.5
126
130
131
134.5
136.5
143.5
176
177
198
53.77
56.31
62.58
64.78
71.31
67.39
69.89
85.02
81.79
82
80.83
87.5
95
98
104
101
101
107
114
112.5
119.5
138
59.79
61.48
64.12
71.08
11
14.37
13.28
15.66
.
15.81
16.68
17.42
12.06
19.32
19.93
20.67
23.36
27.86
30.04
25.89
5.91
4.32
7.25
8.51
6.47
9.24
8.63
6.22
8.65
10.29
12.08
11
10.8
11.7
11.8
12.38
13.25
14.66
13.87
15.33
15.14
18.8
7.14
8.69
7.91
8.68
11.48
14.37
15.27
17.82
19.88
16.8
16.69
20.63
22.07
20.61
20.21
24.88
24.75
29.82
32.04
30.49
6.87
7.6
7.98
8.4
6.67
8.97
8.73
7.28
9.41
10.88
12.12
12.47
12.71
12.25
6.83
12.57
13.31
13.99
14.89
16.13
16.45
20.39
6.58
8.49
8.44
9.68
115.5
127.77
134
148
148.5
152
153.5
164.5
165.5
173
177
184.5
194.5
236
241
260
66.92
69.18
78.3
83.15
85.07
86.45
87.74
99.38
100.84
103.5
106.32
111.5
120
122.5
124.5
126.5
128.5
137.5
144
145.5
152.5
178.5
74.59
79.43
81.56
90.48
m
m
m
m
m
m
m
m
m
m
m
m
m
m
m
m
if
m
m
m
if
m
m
m
if
m
m
m
m
m
if
m
m
m
m
m
m
m
m
m
m
m
67
Date
Site
CW
CL
Bwt
Lwt
Rwt
Twt
Sex
11-Aug-06
11-Aug-06
11-Aug-06
11-Aug-06
11-Aug-06
11-Aug-06
11-Aug-06
11-Aug-06
11-Aug-06
11-Aug-06
11-Aug-06
11-Aug-06
11-Aug-06
11-Aug-06
11-Aug-06
11-Aug-06
11-Aug-06
11-Aug-06
11-Aug-06
11-Aug-06
11-Aug-06
11-Aug-06
11-Aug-06
11-Aug-06
11-Aug-06
11-Aug-06
11-Aug-06
11-Aug-06
11-Aug-06
11-Aug-06
11-Aug-06
11-Aug-06
11-Aug-06
11-Aug-06
11-Aug-06
11-Aug-06
11-Aug-06
11-Aug-06
11-Aug-06
11-Aug-06
11-Aug-06
11-Aug-06
3
3
3
3
3
3
3
3
3
3
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
4
5
5
5
5
5
5
5
5
5
5
5
5
5
5
122
125
126
130
139
145
148
166
155
175
128
114
113
117
120
122
143
130
138
143
135
141
141
144
144
140
150
156
109
106
110
109
119
124
122
127
121
120
121
125
130
129
58
56
57
60
62
61
63
71
73
76
56
51
55
56
53
57
66
61
59
63
67
64
64
66
66
65
69
71
47
52
53
52
57
58
55
57
60
59
58
56
59
58
74.39
76.5
85.5
88.5
108.5
109
107
141
148
181.5
66.38
62.81
70
63.29
67.37
75.5
101
93.5
99
101
108
107.5
114.5
119
112.5
116
127.5
138
51.2
55.84
58.86
59.04
69.97
74.68
74.51
74.61
82
82.42
82.5
82
83
93
9.11
10.61
9.83
12.21
14.49
13.45
14.72
20.95
20.2
27.2
.
7.65
4.45
8.02
8.06
8.75
7.1
11.92
12.99
13.42
13.54
14.25
15.24
15.79
14.98
16.94
18.01
20.99
5.86
6.47
7.93
6.05
7.96
9.32
7.34
8.57
5.96
12.09
9.32
10.02
9.78
11.38
10.8
10.82
10.55
12.58
13.53
13.9
15.48
19.82
20.47
26.25
8.9
8.15
4.28
7.8
8.99
8.19
9.69
12.15
13.98
13.13
13.71
15.23
13.44
9.44
15.91
16.55
16.53
20.44
6.17
7.13
3.35
6.49
.
.
9.06
7.88
8.94
5.4
10.16
10.9
10.79
.
94.46
98.5
106.5
113.5
136.6
137
138
183
189.5
237.5
74.95
79.01
79.22
79.61
84.88
93
118.5
118.5
126.5
127.5
136.5
137.5
143.5
145.5
145.5
150.5
163
181.5
63.49
69.73
69.87
72.73
78.56
84.19
91.7
91.79
97
100.04
102.5
103.5
104
104.5
m
m
m
m
m
m
m
m
m
m
m
m
m
m
m
m
m
m
m
m
m
m
m
m
m
m
m
m
m
m
m
m
m
m
if
m
m
m
m
m
m
m
68
Date
Site
CW
CL
Bwt
Lwt
Rwt
Twt
Sex
11-Aug-06
11-Aug-06
11-Aug-06
11-Aug-06
11-Aug-06
11-Aug-06
11-Aug-06
11-Aug-06
11-Aug-06
11-Aug-06
11-Aug-06
11-Aug-06
11-Aug-06
11-Aug-06
11-Aug-06
11-Aug-06
11-Aug-06
11-Aug-06
11-Aug-06
11-Aug-06
11-Aug-06
11-Aug-06
11-Aug-06
11-Aug-06
11-Aug-06
15-Aug-06
15-Aug-06
15-Aug-06
15-Aug-06
15-Aug-06
15-Aug-06
15-Aug-06
15-Aug-06
15-Aug-06
15-Aug-06
15-Aug-06
15-Aug-06
15-Aug-06
15-Aug-06
15-Aug-06
15-Aug-06
15-Aug-06
5
5
5
5
5
5
5
5
5
5
5
5
6
6
6
6
6
6
6
6
6
7
7
7
7
1
1
1
1
1
1
1
2
2
2
2
2
2
2
2
2
2
126
138
138
139
125
150
156
153
149
152
149
166
130
128
129
133
141
142
161
161
175
109
129
143
154
82
102
113
126
149
141
162
84
100
108
106
115
111
121
139
138
145
57
59
61
62
63
66
69
67
67
71
69
73
57
59
58
62
63
64
67
69
72
49
56
64
70
42
45
54
60
62
65
72
43
53
53
52
56
56
57
62
73
75
84.5
79.81
97
97.5
98
100.5
123
125.5
130.5
142.5
122.5
162.5
82.5
85
86
87
98
102.5
126
138
160
53.7
81.23
116
123.5
29.88
40.04
64.31
86.92
112
112
158
29.54
50.83
56.65
52.26
57.21
66.59
67.95
86.42
138
161
10.32
12.06
11.75
12.19
12.26
13.26
16.67
18.85
10.48
.
19.61
23.21
8.94
10.93
10.85
10.99
12.55
10.52
18.47
20.05
17.23
6.2
12.05
14.95
15.25
3.18
4.34
8.24
10.65
11.89
16.5
24.56
.
6.21
.
6.13
6.32
7.47
10.16
10.99
16.09
.
10.52
12.76
12.82
12.74
12.77
14.25
16.85
14.99
17.94
22.13
20.07
23
9.73
10.37
11.67
12.37
12.83
10.36
18.78
19.23
20.62
4.15
11.85
14.98
16.42
.
4.78
.
12.11
18.82
16.25
26.99
3.41
.
5.84
6.27
3.69
7.83
9.63
11.96
22.14
25.84
105.5
106
122
123
123.5
128.5
156.5
160.5
160.5
164.5
166
210.5
102
108
110
111
124
124.5
166.5
178.5
199.5
64.53
106.29
147.5
157
33.13
49.37
72.72
110.64
143.5
145
211
33.15
57.28
62.62
65.09
67.69
82.39
89.45
111.04
177.5
187.5
m
m
m
m
m
m
m
m
m
m
m
m
m
m
m
m
m
m
m
m
f
m
m
m
m
m
m
m
m
m
m
m
m
m
m
m
m
m
m
m
m
m
69
Date
Site
CW
CL
Bwt
Lwt
Rwt
Twt
Sex
15-Aug-06
15-Aug-06
15-Aug-06
15-Aug-06
15-Aug-06
15-Aug-06
15-Aug-06
15-Aug-06
15-Aug-06
15-Aug-06
15-Aug-06
15-Aug-06
15-Aug-06
23-Aug-06
23-Aug-06
23-Aug-06
23-Aug-06
23-Aug-06
23-Aug-06
23-Aug-06
23-Aug-06
23-Aug-06
23-Aug-06
23-Aug-06
23-Aug-06
23-Aug-06
23-Aug-06
23-Aug-06
23-Aug-06
23-Aug-06
23-Aug-06
23-Aug-06
23-Aug-06
23-Aug-06
23-Aug-06
23-Aug-06
23-Aug-06
23-Aug-06
23-Aug-06
23-Aug-06
23-Aug-06
23-Aug-06
3
3
4
4
4
4
4
4
4
5
5
6
6
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
2
2
2
2
2
2
2
2
2
2
2
2
2
2
128
141
120
127
130
133
140
141
170
130
136
145
152
126
126
138
127
125
129
132
139
146
149
157
145
153
167
170
80
110
105
115
111
116
124
131
130
123
143
144
144
167
61
66
53
60
61
62
61
67
76
59
64
68
68
61
59
66
59
59
63
58
65
63
66
71
68
70
70
77
39
55
55
55
54
58
60
56
60
62
64
66
65
75
89.03
101.5
61.52
74.65
86.08
92.5
91
105.5
175.5
81.4
98.5
97.29
113
78.5
81
83.85
86.61
83
88.5
92.5
109.5
110.5
114.5
121
127
143
141
170
25.15
57.47
60.42
63.85
57.39
65.54
73.44
77.54
86
86
102.5
110.5
116
138.5
11.13
13.11
7.01
11.04
10.31
11.23
12.77
12.72
26.15
11.17
13.64
12.79
17.14
10.56
10.51
11.78
.
10.86
11.45
11.37
14.06
15.48
15.71
19.38
19.63
26.68
22.67
27.45
1.26
7.76
7.6
8.69
7.56
9.15
9.16
10.36
10.64
10.25
12.21
13.71
16.7
21.17
13.3
13.99
7.62
10.91
10.91
9.86
11.9
7.78
28.98
10.64
11.52
.
14.35
.
.
.
11.47
12.43
12.26
12.89
15.55
17.96
17.93
21.37
16.1
17.52
26.28
31.34
.
.
.
.
8.59
.
9.91
9.42
11.64
11.37
12.6
12.19
8.51
23.49
114.27
129.5
76.97
98.36
108
115
116
126.5
232.5
104.53
124.5
110.74
146.5
89
92
95.92
98.49
106.5
112.5
117
140
144
148.5
162.5
164
182
196.5
230
26.52
65.43
68.51
72.79
74.09
75.81
93.49
98.1
108.5
109.5
128
137
141.5
191
m
m
m
m
m
m
m
m
m
m
m
m
m
m
m
m
m
m
m
m
m
m
m
m
m
m
m
m
m
m
m
m
m
m
if
m
m
m
m
m
m
m
70
Date
Site
CW
CL
Bwt
Lwt
Rwt
Twt
Sex
23-Aug-06
23-Aug-06
23-Aug-06
23-Aug-06
23-Aug-06
23-Aug-06
23-Aug-06
23-Aug-06
23-Aug-06
23-Aug-06
23-Aug-06
23-Aug-06
23-Aug-06
23-Aug-06
23-Aug-06
23-Aug-06
23-Aug-06
23-Aug-06
23-Aug-06
23-Aug-06
23-Aug-06
23-Aug-06
23-Aug-06
23-Aug-06
23-Aug-06
23-Aug-06
23-Aug-06
23-Aug-06
7-Sep-06
7-Sep-06
7-Sep-06
7-Sep-06
7-Sep-06
7-Sep-06
7-Sep-06
7-Sep-06
7-Sep-06
7-Sep-06
7-Sep-06
7-Sep-06
7-Sep-06
7-Sep-06
3
3
3
3
3
3
3
3
3
3
3
4
4
4
4
4
4
4
4
4
4
5
5
5
5
5
5
5
1
1
1
1
1
1
1
1
1
1
1
1
1
1
109
112
134
133
135
128
147
142
157
150
157
114
134
129
122
143
144
134
138
149
155
115
116
122
134
148
163
172
135
131
126
136
140
146
144
145
149
151
150
152
164
165
55
56
65
65
62
66
65
66
71
69
69
56
62
64
58
66
67
64
67
72
70
55
57
56
63
67
75
78
60
59
60
62
64
63
69
66
68
70
70
70
72
75
61.1
61.97
82
87
86
107.5
104.5
106.5
123
120.5
113
72.31
80.5
86.5
79.18
87.5
97.5
100.5
104
123.5
142.5
58.92
68.17
74.5
84
104.5
146.5
181
85.5
83.93
90
97.5
98.5
103.5
110
121.5
140.5
128
128
141.5
147
165.5
6.8
7.68
11.72
8.09
11.21
.
13.38
11.59
14.53
15.73
18.3
.
10.58
.
9.75
12.59
12.8
12.55
13.15
20.52
20.69
7.96
7.47
9.31
11.59
14.17
21.07
30.02
.
6.2
12.02
11.03
13.84
14.22
15.97
19.78
22.14
19.78
18.77
17.66
21.85
25.04
7.49
8.02
13.41
12.31
9.84
14.54
13.5
13.38
.
16.38
18.17
7.93
.
6.93
7.84
.
14.92
13.32
14.46
21.96
20.07
7.72
7.7
9.76
12.66
13.72
18.39
17.01
14.09
11.46
11.96
12.1
14.31
15.58
18.43
19.68
.
21.92
22.15
22.67
23.75
27.22
76.03
78.47
108
109
112
122.5
131.5
132
138
152.5
155
80.81
91.5
93
97.67
100.5
127
127.5
133
168.5
185.5
75.54
83.6
94.5
109
134
188
237
100
102.08
114.5
120.5
128.5
134
146
162.5
163.5
169.5
169.5
183.5
193.5
221.5
m
m
m
m
m
m
m
m
if
m
m
m
m
m
m
m
m
m
m
m
m
m
m
m
m
m
m
m
m
if
m
if
m
m
m
m
m
m
m
m
m
m
71
Date
Site
CW
CL
Bwt
Lwt
Rwt
Twt
Sex
7-Sep-06
7-Sep-06
7-Sep-06
7-Sep-06
7-Sep-06
7-Sep-06
7-Sep-06
7-Sep-06
7-Sep-06
7-Sep-06
7-Sep-06
7-Sep-06
7-Sep-06
7-Sep-06
7-Sep-06
7-Sep-06
7-Sep-06
7-Sep-06
7-Sep-06
7-Sep-06
7-Sep-06
7-Sep-06
7-Sep-06
7-Sep-06
7-Sep-06
7-Sep-06
20-Sep-06
20-Sep-06
20-Sep-06
20-Sep-06
20-Sep-06
20-Sep-06
20-Sep-06
20-Sep-06
20-Sep-06
20-Sep-06
20-Sep-06
20-Sep-06
20-Sep-06
20-Sep-06
20-Sep-06
20-Sep-06
1
1
1
2
2
2
2
2
2
2
2
2
2
2
3
3
3
3
4
4
4
4
4
5
5
5
1
1
1
1
1
1
1
1
2
2
2
2
2
2
2
2
180
166
195
98
105
112
124
130
135
137
146
151
160
153
117
121
139
170
101
125
130
142
145
136
147
163
109
120
124
161
155
157
176
161
118
105
129
114
115
120
126
127
81
77
88
51
53
57
62
62
63
65
66
69
72
70
57
62
66
72
48
56
63
68
70
66
65
73
50
56
57
68
69
73
72
71
50
51
52
54
55
57
56
52
207
187
241
49.36
50.57
69.31
92.5
98
102.5
116
119.5
127
141.5
140
66.81
83.82
102.5
139.5
50.33
76.48
92
111.5
132.5
106.5
111
153
49.73
70.38
71.06
130.5
135
153
161.5
163.5
62.48
57.5
65.5
61.5
63.5
65.5
69.5
70
15.9
36.78
42.23
.
4.55
7.79
6.17
11.28
8.23
17.6
17.2
18.78
18.96
25.58
7.17
12.09
11.66
15.33
5.49
9.57
11.28
16.89
16.98
11.61
13.74
21.54
5.68
8.11
.
.
22.4
12.81
24.69
26.72
6.16
6.56
7.56
7.65
7.11
7.43
9.15
8.58
16.39
24.91
49.29
5.93
5.98
8.51
13.12
12.43
13.32
17.88
17.43
16.62
20.7
22.82
7.92
.
11.64
17.34
4.09
7.58
12.5
16.51
17.92
13.72
13.37
23.25
5.29
.
9.86
19.66
22.43
24.57
27.09
23.83
6.7
6.89
.
8.26
8.08
8.98
6.36
8.65
240.5
252.5
338.5
55.71
61.37
86.22
113
122
124.5
153
155
162.5
183
188.5
83.3
96.27
128
176.5
59.24
95.06
116
146.5
168.5
133.5
139
198.5
63.54
78.69
81.64
151
180.5
191.5
214
216.5
69.81
71.5
73.5
77.5
80.5
81.5
85.5
87.5
m
m
m
m
m
m
m
m
m
m
m
m
m
m
if
m
m
f
m
m
m
m
m
m
f
m
m
m
m
m
m
m
m
m
m
m
m
m
m
m
m
m
72
Date
Site
CW
CL
Bwt
Lwt
Rwt
Twt
Sex
20-Sep-06
20-Sep-06
20-Sep-06
20-Sep-06
20-Sep-06
20-Sep-06
20-Sep-06
20-Sep-06
20-Sep-06
20-Sep-06
20-Sep-06
20-Sep-06
20-Sep-06
20-Sep-06
20-Sep-06
20-Sep-06
20-Sep-06
20-Sep-06
28-Sep-06
28-Sep-06
28-Sep-06
28-Sep-06
28-Sep-06
28-Sep-06
28-Sep-06
28-Sep-06
28-Sep-06
28-Sep-06
28-Sep-06
28-Sep-06
28-Sep-06
28-Sep-06
28-Sep-06
28-Sep-06
28-Sep-06
28-Sep-06
28-Sep-06
28-Sep-06
11-Oct-06
11-Oct-06
11-Oct-06
11-Oct-06
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
3
4
1
1
1
1
1
1
1
1
1
1
1
1
2
2
2
2
2
3
3
3
1
1
1
1
122
125
132
137
121
129
146
134
138
140
155
135
153
145
155
161
113
135
107
115
129
134
142
145
156
175
168
179
168
178
121
113
137
136
167
109
130
145
110
117
132
155
57
57
59
61
55
61
60
61
63
61
64
63
67
65
71
71
54
69
49
51
60
61
62
63
70
81
71
78
78
77
57
54
65
62
73
51
60
69
47
56
56
62
73.5
75.5
85
84.5
78.5
82
87.5
95.5
96.5
101
108
103
118.5
121.5
133
140.5
54.5
125
53.74
58
83
95
100.5
121
138
201.5
160
186.5
180.5
193
71.69
59.95
95
96.5
161
51.58
78.88
125
44.65
73.92
75.95
91.5
9.6
8.85
10.32
9.23
10.1
10.14
10.48
13.3
11.75
11.62
14.76
12.99
.
15.31
17.43
12.42
6.31
15.71
6.05
7.34
10.25
11.05
13.68
.
20.56
.
26.31
37.79
34.67
33.61
.
6.89
12.05
12.75
10.64
5.09
5.91
.
5.36
7.9
8.57
.
8.42
10.63
.
5.51
10.08
10.81
11.01
5.81
12.52
11.7
14.99
13.79
15.82
16.43
19.05
20.43
6.67
18.55
4.71
6.91
11.33
.
14.55
16.14
23.57
.
30.3
.
35.92
36.72
.
7.07
7.36
13.42
26.26
6.39
10.13
15.51
4.2
.
6.61
9.86
91.5
95.5
95.5
99.5
99.5
103.5
109.5
114.5
120.5
126.5
128.5
132.5
135
156.6
169.5
174
67.5
160.5
64.7
72.5
106.5
106.5
129.5
137.5
184
201.5
218.5
224.5
253.5
268.5
71.69
74.8
114.5
123.5
201
63.68
97.21
141.5
54.57
82.02
91.84
101.5
m
m
m
m
m
m
m
m
m
m
m
m
m
m
m
m
m
m
m
m
m
m
m
m
m
m
m
m
m
m
m
m
m
m
m
m
m
m
m
if
if
f
73
Date
Site
CW
CL
Bwt
Lwt
Rwt
Twt
Sex
11-Oct-06
11-Oct-06
11-Oct-06
11-Oct-06
11-Oct-06
11-Oct-06
11-Oct-06
11-Oct-06
11-Oct-06
11-Oct-06
11-Oct-06
11-Oct-06
11-Oct-06
11-Oct-06
11-Oct-06
11-Oct-06
11-Oct-06
11-Oct-06
11-Oct-06
11-Oct-06
11-Oct-06
11-Oct-06
11-Oct-06
11-Oct-06
11-Oct-06
18-Oct-06
18-Oct-06
18-Oct-06
18-Oct-06
18-Oct-06
18-Oct-06
18-Oct-06
18-Oct-06
18-Oct-06
18-Oct-06
18-Oct-06
18-Oct-06
18-Oct-06
18-Oct-06
18-Oct-06
18-Oct-06
18-Oct-06
1
1
1
1
1
2
2
2
3
3
3
3
3
3
4
4
4
4
4
4
5
5
5
7
7
1
1
1
1
1
1
1
1
1
1
1
2
2
2
2
2
3
131
148
150
171
174
133
140
140
135
142
149
152
141
153
131
131
145
146
148
147
128
164
180
166
183
122
143
160
145
169
156
160
173
159
184
181
127
159
169
161
182
116
59
64
65
76
77
60
61
64
63
63
66
67
65
68
60
62
62
68
64
64
60
72
73
70
74
54
62
68
66
74
69
73
72
75
78
81
55
70
73
72
76
56
81.41
104.5
115.5
198.5
200
79.12
87.98
102.5
97.5
101
105.5
115.5
118
124.5
86.67
87
91.5
114
108
112.5
86
150
148
138.5
179
71.04
107.5
137
131
154.5
134
155
157.5
171.5
192.5
199.5
87.04
145.5
164.5
164.5
175.5
78.66
12.02
.
.
31.61
38.61
9.44
10.37
11.13
.
12.52
13.68
15.46
14.97
18.19
9.81
11.48
11.41
8.17
13.1
13.71
10.47
.
15.94
18.93
19.14
7.21
14.05
17.8
18.35
25.37
22.78
23.09
23.95
28.51
34.1
28.28
9.24
23.89
22.31
27.36
26.06
9.85
12.96
14.11
15.72
34.04
32.61
9.86
7.65
11.22
11.68
14.17
13.62
16.32
16.16
19.11
7.77
12.8
12.53
8.26
15.67
14.7
9.81
19.61
18.03
21.37
22.77
4.29
15.99
8.81
21.37
.
22.93
26.52
26.21
31.32
34.43
31.47
10.82
27.29
28.15
30
29.29
6.04
107.48
119
131
266
271.5
99.59
106.27
125
109.5
128
137
147.5
149
162.5
104.97
113.5
115.5
131.5
138.5
141.5
106.5
169.5
182
181
221.5
82.86
137.5
164
171
180
181.5
205
208
234.5
262.5
263
108.29
198.5
217.5
223.5
236.5
95.16
m
m
m
m
m
m
if
m
m
m
m
m
m
m
m
m
m
m
m
m
m
m
f
m
f
if
m
m
m
m
m
m
m
m
m
m
if
m
m
m
m
m
74
Date
Site
CW
CL
Bwt
Lwt
Rwt
Twt
Sex
18-Oct-06
18-Oct-06
18-Oct-06
18-Oct-06
18-Oct-06
18-Oct-06
18-Oct-06
18-Oct-06
25-Oct-06
25-Oct-06
25-Oct-06
25-Oct-06
25-Oct-06
25-Oct-06
25-Oct-06
25-Oct-06
25-Oct-06
7-Nov-06
7-Nov-06
7-Nov-06
7-Nov-06
3
4
5
5
6
6
6
6
1
1
1
1
1
1
1
2
4
1
1
1
6
160
144
115
189
154
173
165
166
123
145
164
157
155
175
195
126
125
119
142
132
194
68
68
52
75
67
71
72
73
53
67
66
64
69
75
82
56
63
53
62
61
81
144.5
129.5
59.94
180
124.5
156
163
161.5
64.75
105.99
131
127
143.5
179.5
230
67.37
86.5
60.5
84
89.87
208.5
21.37
15.07
.
17.84
15.84
15.86
25.48
30.96
8.02
11.71
.
16.61
23.01
28.62
38.47
6.38
.
6.82
9.72
11.81
23.16
16.59
16.73
7.44
19.97
17.48
18.19
30.21
33.45
9.22
12.81
.
18.38
25.67
32.04
43.89
6.36
.
7.93
10.29
10.81
25.43
182.5
161.5
67.51
220
158
190.5
223
230.5
82.24
130.62
131
162.5
194
241
314
83.25
86.5
75.5
104
112.5
258.5
m
m
m
f
m
f
m
m
m
if
m
m
m
m
m
m
m
m
m
m
f
75
APPENDIX II
Appendix II. Raw data for blue crabs collected from 18 July 2006, 19 August 2006, and
17 November 2006, from Fourchon/Grand Isle with collection date, collection site,
carapace width (mm), carapace length (mm), cheliped-free body weight (g), left cheliped
weight (g), right cheliped weight (g), total body weight (g), and sex in the lower Barataria
Estuary. CW=Carapace width, CL=Carapace length, Bwt=Cheliped-free body weight,
Lwt=Left cheliped weight, Rwt=Right cheliped weight, Twt=Total body weight.
Date
Site
CW
CL
Bwt
Lwt
Rwt
Twt
Sex
18-Jul-06
18-Jul-06
18-Jul-06
18-Jul-06
18-Jul-06
18-Jul-06
18-Jul-06
18-Jul-06
18-Jul-06
18-Jul-06
18-Jul-06
18-Jul-06
18-Jul-06
18-Jul-06
18-Jul-06
18-Jul-06
18-Jul-06
18-Jul-06
18-Jul-06
18-Jul-06
18-Jul-06
18-Jul-06
18-Jul-06
18-Jul-06
18-Jul-06
18-Jul-06
18-Jul-06
18-Jul-06
18-Jul-06
18-Jul-06
18-Jul-06
Fourchon
Fourchon
Fourchon
Fourchon
Fourchon
Fourchon
Fourchon
Fourchon
Fourchon
Fourchon
Fourchon
Fourchon
Fourchon
Fourchon
Fourchon
Fourchon
Fourchon
Fourchon
Fourchon
Fourchon
Fourchon
Fourchon
Fourchon
Fourchon
Fourchon
Fourchon
Fourchon
Fourchon
Fourchon
Fourchon
Fourchon
78
84
88
86
92
97
105
115
102
95
117
104
109
105
123
126
119
131
133
103
129
124
109
122
123
131
127
109
120
121
116
40
42
46
44
43
52
53
50
53
52
52
52
52
50
53
54
57
57
57
55
58
57
56
54
62
57
59
55
60
57
60
38
38.5
50.5
43.5
49
68
68.5
71
61.5
66.5
70
71
72.5
80
76
84.5
77.5
84
93
76.5
83
82.5
81.5
84.5
111.5
92.5
97
90.5
88.5
87
89
4.17
4.51
6.49
4.68
.
.
.
7.18
7.91
8.31
6.88
6.91
7.77
9.39
8.74
9.38
9.44
8.49
9.91
10.66
9.19
9.06
10.1
9.21
.
9.66
14.64
12.74
11.79
14.17
12.61
5.29
3.88
5.05
5.91
6.89
.
4.43
.
11.72
10.16
10.21
11.95
9.36
.
8.02
.
9.22
9.21
.
16.23
13.59
12.29
12.49
11.64
.
11.42
.
13.22
13.32
14.86
15.81
45.5
46.5
52
53.5
55
68
73
79
82
86.5
90
90.5
91.5
92
93
94.5
99.5
102
104
104.5
105
105.5
105.5
107
111.5
113.5
114
114.5
114.5
116.5
118.5
if
if
if
if
if
m
if
m
if
m
f
if
if
m
f
f
f
f
f
m
f
f
m
f
m
f
m
m
m
m
m
76
Date
Site
CW
CL
Bwt
Lwt
Rwt
Twt
Sex
18-Jul-06
18-Jul-06
18-Jul-06
18-Jul-06
18-Jul-06
18-Jul-06
18-Jul-06
18-Jul-06
18-Jul-06
18-Jul-06
18-Jul-06
18-Jul-06
18-Jul-06
18-Jul-06
18-Jul-06
18-Jul-06
18-Jul-06
18-Jul-06
18-Jul-06
18-Jul-06
18-Jul-06
18-Jul-06
18-Jul-06
18-Jul-06
18-Jul-06
18-Jul-06
18-Jul-06
18-Jul-06
18-Jul-06
18-Jul-06
18-Jul-06
18-Jul-06
18-Jul-06
18-Jul-06
18-Jul-06
18-Jul-06
18-Jul-06
18-Jul-06
18-Jul-06
18-Jul-06
18-Jul-06
18-Jul-06
Fourchon
Fourchon
Fourchon
Fourchon
Fourchon
Fourchon
Fourchon
Fourchon
Fourchon
Fourchon
Fourchon
Fourchon
Fourchon
Fourchon
Fourchon
Fourchon
Fourchon
Fourchon
Fourchon
Fourchon
Fourchon
Fourchon
Fourchon
Fourchon
Fourchon
Fourchon
Fourchon
Fourchon
Fourchon
Fourchon
Fourchon
Fourchon
Fourchon
Fourchon
Fourchon
Fourchon
Fourchon
Fourchon
Fourchon
Fourchon
Fourchon
Fourchon
132
127
130
144
133
137
140
119
130
131
128
129
120
129
124
134
123
127
132
130
132
137
134
129
136
140
127
143
129
133
149
154
134
143
150
135
137
140
136
130
128
143
59
61
58
67
58
57
65
56
63
59
62
60
59
63
58
58
65
61
60
62
60
62
62
61
62
62
62
60
52
65
69
65
66
69
65
60
65
72
62
62
60
62
95.5
100.5
96
101.5
99
99
126
94
110
92
111
94
98.5
111.5
98
99
118
115
114.5
110.5
105
109
117.5
103.5
113
108
101.5
116.5
104.5
101
126
147
113.5
152
120
114
119
109.5
118.5
119.5
120
121
9.69
19.8
10.65
7.56
12.34
10.02
.
14.45
17.55
15.75
17.07
18.5
13.29
.
14.23
15.31
16.92
.
19.37
6.68
16.05
14.93
20.04
18.97
15.31
12.37
16.49
12.86
18.63
41.55
.
.
18.43
.
13.1
18.14
19.95
24.69
18.04
27.79
20.18
22.23
12.23
.
12.1
11.48
10.41
12.04
.
17.25
.
18.8
.
14.25
16.8
18.25
16.32
16.96
.
18.64
.
19.51
16.8
12.82
.
15.86
11.69
21.35
23.47
15.53
18.64
23.55
19.48
.
14.31
.
16.38
18.23
13.99
19.68
20.18
17.89
22.27
16.82
119
120.3
121
122.5
125.5
126
126
127
127
128
128
129
129.5
129.5
131
132
135
136
136
138
138.5
139
139
142.5
143
143
143
145
145
146
147
147
148
152
153
153.5
155.5
157
159
159.5
159.5
160
f
m
f
f
f
f
m
m
m
m
m
m
m
m
m
m
m
m
m
m
m
f
m
m
f
m
m
f
m
m
m
f
m
m
f
m
m
m
m
m
m
m
77
Date
Site
CW
CL
Bwt
Lwt
Rwt
Twt
Sex
18-Jul-06
18-Jul-06
18-Jul-06
18-Jul-06
18-Jul-06
18-Jul-06
18-Jul-06
18-Jul-06
18-Jul-06
18-Jul-06
18-Jul-06
18-Jul-06
18-Jul-06
18-Jul-06
18-Jul-06
18-Jul-06
18-Jul-06
18-Jul-06
18-Jul-06
18-Jul-06
18-Jul-06
18-Jul-06
18-Jul-06
18-Jul-06
18-Jul-06
18-Jul-06
18-Jul-06
18-Jul-06
18-Jul-06
18-Jul-06
18-Jul-06
18-Jul-06
18-Jul-06
18-Jul-06
18-Jul-06
18-Jul-06
18-Jul-06
18-Jul-06
18-Jul-06
18-Jul-06
18-Jul-06
18-Jul-06
Fourchon
Fourchon
Fourchon
Fourchon
Fourchon
Fourchon
Fourchon
Fourchon
Fourchon
Fourchon
Fourchon
Fourchon
Fourchon
Fourchon
Fourchon
Fourchon
Fourchon
Fourchon
Fourchon
Fourchon
Fourchon
Fourchon
Fourchon
Fourchon
Fourchon
Fourchon
Fourchon
Fourchon
Fourchon
Fourchon
Fourchon
Fourchon
Fourchon
Fourchon
Fourchon
Fourchon
Fourchon
Fourchon
Fourchon
Fourchon
Fourchon
Fourchon
143
137
153
130
144
138
149
148
154
149
143
140
137
143
154
136
145
144
142
155
140
152
143
150
174
148
176
152
149
163
153
157
157
156
152
178
176
159
161
157
164
152
64
62
65
62
61
62
69
67
68
75
73
64
65
65
68
63
66
68
67
68
70
68
68
69
72
69
71
73
70
75
73
71
69
73
70
71
75
70
72
75
72
73
127.5
115.5
129
127.14
119.5
124
145
137.5
157
117.5
126
133
130.5
127
156
136
140
136
140
142
161
165
143.5
152.5
162.5
152
178
180
163.5
174.5
160
163
165
188
166.5
192
197
174.5
182.5
162.5
182.5
172.5
12.37
20.3
15.81
18.29
21.15
20.26
.
15.26
19.07
25.78
20.69
25.15
22.75
24.39
25.56
26.91
22.72
29.06
29.3
27.85
.
31.47
28.22
32.67
22.45
25.04
18.46
19.11
26.51
29.82
23.55
31.2
36.61
21.05
34.03
29.27
24.07
38.07
28.52
34.36
37.72
37.5
17.17
22.39
18.94
21.57
24.55
23.97
27.6
21.05
.
27.36
24.03
19.77
26.32
27.04
.
24.69
25.43
26.99
26.18
27.81
34.29
.
32.15
19.8
21.32
32.15
23.29
19.48
29.25
20.14
43.35
39.08
32.02
26.67
38.09
25.1
19.7
31.22
42.82
41.02
32.47
43.91
160
160
166
167
167.5
170
173
174.5
175
176.5
178
179.5
180.5
180.5
184
190
192
196
197
197
197
197.5
203.5
207
210.5
212.5
219.5
221
222
226.5
227
238
239.5
241
242.5
246
247
248.5
253.5
254
260.5
262
f
m
f
m
m
m
m
f
f
m
m
m
m
m
m
m
m
m
m
m
m
m
m
m
f
m
f
m
m
m
m
m
m
m
m
f
f
m
m
m
m
m
78
Date
Site
CW
CL
Bwt
Lwt
Rwt
Twt
Sex
18-Jul-06
18-Jul-06
18-Jul-06
18-Jul-06
18-Jul-06
18-Jul-06
18-Jul-06
18-Jul-06
18-Jul-06
19-Aug-06
19-Aug-06
19-Aug-06
19-Aug-06
19-Aug-06
19-Aug-06
19-Aug-06
19-Aug-06
19-Aug-06
19-Aug-06
19-Aug-06
19-Aug-06
19-Aug-06
19-Aug-06
19-Aug-06
19-Aug-06
19-Aug-06
19-Aug-06
19-Aug-06
19-Aug-06
19-Aug-06
19-Aug-06
19-Aug-06
19-Aug-06
19-Aug-06
19-Aug-06
19-Aug-06
19-Aug-06
19-Aug-06
19-Aug-06
19-Aug-06
19-Aug-06
19-Aug-06
Fourchon
Fourchon
Fourchon
Fourchon
Fourchon
Fourchon
Fourchon
Fourchon
Fourchon
Grand Isle
Grand Isle
Grand Isle
Grand Isle
Grand Isle
Grand Isle
Grand Isle
Grand Isle
Grand Isle
Grand Isle
Grand Isle
Grand Isle
Grand Isle
Grand Isle
Grand Isle
Grand Isle
Grand Isle
Grand Isle
Grand Isle
Grand Isle
Grand Isle
Grand Isle
Grand Isle
Grand Isle
Grand Isle
Grand Isle
Grand Isle
Grand Isle
Grand Isle
Grand Isle
Grand Isle
Grand Isle
Grand Isle
180
167
160
161
176
166
166
171
183
135
128
130
127
137
142
140
125
135
139
134
128
147
146
141
145
141
136
148
133
151
140
130
126
148
155
149
153
128
144
145
137
147
79
78
75
73
82
74
77
79
85
56
56
55
55
59
60
60
58
60
57
61
58
60
59
60
59
62
61
62
58
64
61
61
64
64
65
60
62
62
64
64
60
64
233.5
224
200
202.5
219.5
198
223.5
213.5
291.5
70.18
74.61
73.5
76.58
74.54
97.82
87.62
79.5
83.5
86
92.62
83.42
97
87.5
88.5
91.61
96
91
107.5
95
92
96
94
92.5
118.5
122
98.5
99
95.5
109.5
104
96.5
102.5
14.99
.
42.42
40.14
31.3
43.54
50.32
46.57
37.89
7.87
7.81
7.5
8.97
8.92
.
10.03
9.26
7.48
8.34
11.43
8.61
10.41
8.55
6.59
7.13
4.66
10.88
7.78
9.27
11.61
11.74
9.47
10.66
.
.
10.34
13.45
10.36
14.94
12.1
12.62
10.57
26.39
53.87
39.29
44.02
33.26
48.73
28.19
52.49
74.95
9.21
5.92
9.74
7.59
11.02
.
.
10.9
11.23
10.86
.
14.75
.
11.78
12.13
11.87
11.55
11.46
.
11.72
11.8
8.66
11.21
12.84
.
.
12.68
11.13
14.51
.
9.19
15.47
11.96
276
281
286
288
289.5
296.5
313
317
409.5
88.14
89.32
92.01
94.99
95.89
97.82
98.82
100
102.5
106.5
107.78
107.82
108
108.5
108.5
112.4
112.5
114
116
116.5
116.5
117
117
118.5
118.5
122
122.5
124
124
126
126.5
126.5
127
m
m
m
m
m
m
m
m
m
f
f
f
f
f
f
f
f
f
f
f
f
f
f
f
f
f
f
f
f
f
f
f
f
f
f
f
f
f
f
f
f
f
79
Date
Site
CW
CL
Bwt
Lwt
Rwt
Twt
Sex
19-Aug-06
19-Aug-06
19-Aug-06
19-Aug-06
19-Aug-06
19-Aug-06
19-Aug-06
19-Aug-06
19-Aug-06
19-Aug-06
19-Aug-06
19-Aug-06
19-Aug-06
19-Aug-06
19-Aug-06
19-Aug-06
19-Aug-06
19-Aug-06
19-Aug-06
19-Aug-06
19-Aug-06
19-Aug-06
19-Aug-06
19-Aug-06
19-Aug-06
19-Aug-06
19-Aug-06
19-Aug-06
19-Aug-06
19-Aug-06
19-Aug-06
19-Aug-06
19-Aug-06
19-Aug-06
19-Aug-06
19-Aug-06
19-Aug-06
19-Aug-06
19-Aug-06
19-Aug-06
19-Aug-06
19-Aug-06
Grand Isle
Grand Isle
Grand Isle
Grand Isle
Grand Isle
Grand Isle
Grand Isle
Grand Isle
Grand Isle
Grand Isle
Grand Isle
Grand Isle
Grand Isle
Grand Isle
Grand Isle
Grand Isle
Grand Isle
Grand Isle
Grand Isle
Grand Isle
Grand Isle
Grand Isle
Grand Isle
Grand Isle
Grand Isle
Grand Isle
Grand Isle
Grand Isle
Grand Isle
Grand Isle
Grand Isle
Grand Isle
Grand Isle
Grand Isle
Grand Isle
Grand Isle
Grand Isle
Grand Isle
Grand Isle
Grand Isle
Grand Isle
Grand Isle
144
144
147
155
156
154
146
151
150
154
145
143
145
137
141
156
149
140
153
151
155
141
134
142
159
150
151
146
148
151
158
148
151
145
151
155
163
151
149
157
170
150
61
62
66
63
62
67
60
65
65
65
64
62
63
61
64
63
63
65
66
67
67
62
65
64
65
68
65
65
65
65
69
69
65
64
62
63
65
66
65
63
68
67
102
105.5
101
116.5
103
107
104
108
105.5
107.5
106
108
110
109
107.5
112.5
105.5
111
116.5
117
124
111.5
123
110
112.5
117
115
112.5
115
129
117.5
116
115
115
119
120
124
126.5
121
128
138.5
130.5
10.69
12.15
11.27
11.41
9.59
9.51
11.09
11.28
11.82
12.26
11.89
13.35
11.74
12.04
12.67
10.54
12.5
10.33
7.54
14.79
17.14
16.34
9.35
12.72
16.17
12.12
13.37
13.92
12.8
17.23
14.13
13.14
14.85
13.73
11.43
14.83
13.57
15.7
12.42
13.99
.
16.02
12.98
7.63
12.69
.
12.01
13.6
14.09
13.71
14.21
13.45
15.14
15.4
14.39
15.3
17.16
15.08
18.3
15.04
14.85
8.77
.
11.99
9.44
16.3
13.78
14.21
14.87
17.02
16.55
.
14.66
19.03
19.09
19.51
16.3
13.42
16.09
14.86
20.22
14.92
17.98
11.66
127
127.5
127.5
129
129.5
131
131.5
133.5
134.5
135.5
136
137.5
138.5
138.5
138.5
139
139
140
140.5
142
142
142.5
143.5
143.5
144
144.5
144.5
145
146
147
148.5
149.5
149.5
150
152
154
155.5
157.5
157.5
158.5
158.5
159.5
f
f
f
f
f
f
f
f
f
f
f
f
f
f
f
f
f
f
f
f
f
f
f
f
f
f
f
f
f
f
f
f
f
f
f
f
f
f
f
f
f
f
80
Date
Site
CW
CL
Bwt
Lwt
Rwt
Twt
Sex
19-Aug-06
19-Aug-06
19-Aug-06
19-Aug-06
19-Aug-06
19-Aug-06
19-Aug-06
19-Aug-06
19-Aug-06
19-Aug-06
19-Aug-06
19-Aug-06
19-Aug-06
19-Aug-06
19-Aug-06
19-Aug-06
19-Aug-06
19-Aug-06
19-Aug-06
19-Aug-06
19-Aug-06
19-Aug-06
19-Aug-06
19-Aug-06
19-Aug-06
19-Aug-06
19-Aug-06
19-Aug-06
19-Aug-06
19-Aug-06
19-Aug-06
19-Aug-06
19-Aug-06
19-Aug-06
19-Aug-06
19-Aug-06
19-Aug-06
17-Nov-06
17-Nov-06
17-Nov-06
17-Nov-06
17-Nov-06
Grand Isle
Grand Isle
Grand Isle
Grand Isle
Grand Isle
Grand Isle
Grand Isle
Grand Isle
Grand Isle
Grand Isle
Grand Isle
Grand Isle
Grand Isle
Grand Isle
Grand Isle
Grand Isle
Grand Isle
Grand Isle
Grand Isle
Grand Isle
Grand Isle
Grand Isle
Grand Isle
Grand Isle
Grand Isle
Grand Isle
Grand Isle
Grand Isle
Grand Isle
Grand Isle
Grand Isle
Grand Isle
Grand Isle
Grand Isle
Grand Isle
Grand Isle
Grand Isle
Fourchon
Fourchon
Fourchon
Fourchon
Fourchon
150
150
150
155
160
159
163
171
164
162
166
150
171
170
156
162
170
170
162
177
160
158
165
164
166
179
177
168
173
167
155
168
175
174
177
180
177
100
100
100
107
105
66
70
67
67
70
68
70
71
68
71
68
68
70
71
69
71
75
70
70
70
71
68
71
72
73
74
77
74
71
72
70
71
74
73
75
76
80
51
54
53
54
52
126
131
130
126.5
131
132
133
139.5
137.5
148.5
134
139.5
152
142.5
140
140
158.5
142
139.5
147.5
142.5
144.5
147.5
146.5
156
158
178.5
158.5
157
157.5
156.5
163.5
161.5
157.5
180.5
198
199.5
58.94
66.84
58.65
66.87
72.41
15.61
14.49
15.42
18.05
17.98
14.09
16.72
13.01
18.97
23.93
17.04
15.93
.
9.73
17.29
16.67
.
17.77
19.55
15.94
19.77
17.48
18.26
19.19
22.24
16.75
17.03
21.02
17.32
18.05
17.05
17.18
21.76
16.39
22.14
22.42
23.71
.
.
7.54
9.17
8.52
21.08
19.82
21.26
22.31
13.09
20.35
17.62
18.57
14.67
.
23.4
18.54
24.74
20.87
21.43
23.97
21.8
19.99
16.55
18.68
21.79
21.59
22.15
25.23
11.24
18.76
.
15.02
23.07
23.55
24.72
22.2
17.93
23.34
24.73
29.3
21.52
6.66
.
9.65
11.35
6.83
165.5
168
168.5
168.5
170.5
172
172.5
172.5
175
175
175.5
176
177.5
178
180
181
182.5
183.5
185
185
185.5
186.5
189.5
191.5
192
195.5
196.5
197.5
198.5
201.5
203.5
206
207
213.5
238
254
255
66.7
66.84
76.25
87.69
88.26
f
f
f
f
f
f
f
f
f
f
f
f
f
f
f
f
f
f
f
f
f
f
f
f
f
f
f
f
f
f
f
f
f
f
f
f
f
m
m
m
m
if
81
Date
Site
CW
CL
Bwt
Lwt
Rwt
Twt
Sex
17-Nov-06
17-Nov-06
17-Nov-06
17-Nov-06
17-Nov-06
17-Nov-06
17-Nov-06
17-Nov-06
17-Nov-06
17-Nov-06
17-Nov-06
17-Nov-06
17-Nov-06
17-Nov-06
17-Nov-06
17-Nov-06
17-Nov-06
17-Nov-06
17-Nov-06
17-Nov-06
17-Nov-06
17-Nov-06
17-Nov-06
17-Nov-06
17-Nov-06
17-Nov-06
17-Nov-06
17-Nov-06
17-Nov-06
17-Nov-06
17-Nov-06
17-Nov-06
17-Nov-06
17-Nov-06
Fourchon
Fourchon
Fourchon
Fourchon
Fourchon
Fourchon
Fourchon
Fourchon
Fourchon
Fourchon
Fourchon
Fourchon
Fourchon
Fourchon
Fourchon
Fourchon
Fourchon
Fourchon
Fourchon
Fourchon
Fourchon
Fourchon
Fourchon
Fourchon
Fourchon
Fourchon
Fourchon
Fourchon
Fourchon
Fourchon
Fourchon
Fourchon
Fourchon
Fourchon
117
114
119
116
118
119
129
141
143
125
126
139
125
126
139
127
130
126
142
133
141
154
132
116
133
136
148
139
141
145
145
145
157
162
55
67
57
58
59
63
60
65
63
61
70
66
61
64
64
60
62
62
74
65
63
70
64
67
64
71
66
66
66
67
73
69
74
73
73.06
81
78
83.83
83.5
93.17
90.5
103
96
88
102.5
97.5
92
98
102.5
99.5
100
100
106
114
118.5
131
114
114.5
119.5
109.5
125.5
128
123
143.5
172.5
147.5
151.5
164.5
9.44
6.29
8.94
12.35
11.55
.
9.69
.
10.91
11.7
16.07
21.29
11.72
24.52
12.33
14.21
14.86
13.59
11.54
21.33
.
9.85
16.44
10.59
16.91
26.45
13.54
21.42
21.03
27.51
27.48
23.28
33.02
33.61
8.46
6.49
10.96
10.95
13.24
18.64
12.24
11.92
9.61
16.96
.
.
10.99
.
13.81
15.54
16.88
19.51
15.61
.
19.94
.
13.46
19.18
17.32
20.17
19.2
19.11
26.59
22.07
.
27.2
28.28
29.18
92.01
94.25
98.5
108.02
108.5
112.28
112.5
115.5
117
117.5
118.68
119
119.5
123.5
129.5
129.5
132.5
133.5
134
136
138.5
141
144
145
154.5
156.5
158.5
169
171.5
193.5
200.5
201
214.5
228
if
m
if
m
m
m
if
f
f
m
m
m
m
m
f
m
m
m
f
m
m
f
m
m
m
m
f
m
m
m
m
m
m
m
82
APPENDIX III
Appendix III. Raw data for water quality measurements and CPUE for all sites for all
sample dates from 11 July 2006 to 7 November 2006 with collection date, collection site,
water temperature (TEMP; °C), dissolved oxygen (DO; mg/L), salinity (SAL; ppt), and
specific conductance (COND; µS) in the upper Barataria Estuary.
Date
11-Jul-06
11-Jul-06
11-Jul-06
11-Jul-06
11-Jul-06
11-Jul-06
11-Jul-06
27-Jul-06
27-Jul-06
27-Jul-06
27-Jul-06
27-Jul-06
27-Jul-06
27-Jul-06
4-Aug-06
4-Aug-06
4-Aug-06
4-Aug-06
4-Aug-06
4-Aug-06
4-Aug-06
11-Aug-06
11-Aug-06
11-Aug-06
11-Aug-06
11-Aug-06
11-Aug-06
11-Aug-06
15-Aug-06
15-Aug-06
15-Aug-06
15-Aug-06
15-Aug-06
Site
1
2
3
4
5
6
7
1
2
3
4
5
6
7
1
2
3
4
5
6
7
1
2
3
4
5
6
7
1
2
3
4
5
TEMP
31.65
30.4
30.4
30.4
30.175
30.45
30.405
28.4
28.8
29.4
28.95
28.8
28.05
28.75
34.2
34.2
32.8
32.7
31.75
30.9
32.2
30.75
28.75
26.45
28.5
28.45
28
27
33.1
31.7
32.2
32.2
32.05
DO
7.495
4.93
3.42
3.665
3.87
3.305
4.61
5.78
3.885
2.225
1.53
1.85
1.42
2.425
6.545
4.445
4.87
4.94
5.52
3.125
3.795
4.725
1.145
1.27
1.44
1.35
1.33
1.52
6.91
2.495
3.81
3.44
2.785
83
SAL
0.85
0.35
0.3
0.2
0.2
0.2
0.2
0.7
0.3
0.2
0.2
0.1
0.1
0.1
0.75
0.55
0.2
0.2
0.1
0.1
0.1
0.8
0.15
0.1
0.1
0.1
0.1
0.1
0.55
0.1
0.1
0.1
0.1
COND
1878.5
800
650
600
400
400
300
1448.5
770
383.2
329.05
308.8
292
286.6
1485
1130.5
382.45
343.8
286.5
269.1
241.35
1811.5
330.5
267.6
250.75
233.25
234.85
198.1
1279
254.75
297.4
114.65
202.9
CPUE
6.50
3.50
3.25
3.50
2.25
3.75
5.00
5.00
2.50
5.25
2.50
1.75
1.75
0.00
6.25
3.50
4.25
4.50
3.00
1.00
0.00
5.75
5.50
3.50
4.50
6.50
2.25
1.00
1.75
2.50
0.50
1.75
0.50
Date
15-Aug-06
15-Aug-06
23-Aug-06
23-Aug-06
23-Aug-06
23-Aug-06
23-Aug-06
23-Aug-06
23-Aug-06
7-Sep-06
7-Sep-06
7-Sep-06
7-Sep-06
7-Sep-06
7-Sep-06
7-Sep-06
20-Sep-06
20-Sep-06
20-Sep-06
20-Sep-06
20-Sep-06
20-Sep-06
20-Sep-06
28-Sep-06
28-Sep-06
28-Sep-06
28-Sep-06
28-Sep-06
28-Sep-06
28-Sep-06
11-Oct-06
11-Oct-06
11-Oct-06
11-Oct-06
11-Oct-06
11-Oct-06
11-Oct-06
18-Oct-06
18-Oct-06
18-Oct-06
Site
6
7
1
2
3
4
5
6
7
1
2
3
4
5
6
7
1
2
3
4
5
6
7
1
2
3
4
5
6
7
1
2
3
4
5
6
7
1
2
3
TEMP
31.55
33.15
30.6
30.55
30.4
30.55
30.25
30.05
29.65
30.35
30.2
30.25
29.85
29.65
29.8
30.6
28.2
27.2
26.85
26.6
26.5
26.1
26.05
27.5
27.05
26.1
26.5
25.55
26.1
25.5
26.3
27.4
26.75
26.55
26.05
26
26.65
25.8
26.65
26.3
DO
1.96
3.33
5.495
2.69
2.56
2.66
2.7
3.42
2.31
6.21
5.88
4.08
3.245
3.635
4.175
4.265
5.175
1.345
1.15
1.11
0.975
0.845
1.52
6.44
1.77
1.55
2.095
1.875
2.655
1.8
7.35
6
4.65
4.89
4.65
3.75
3.755
6.665
6.375
5.255
84
SAL
0.1
0.1
0.65
0.5
0.2
0.2
0.1
0.1
0.1
0.65
0.65
0.3
0.15
0.1
0.1
0.1
0.4
0.1
0.1
0.1
0.1
0.1
0.1
0.5
0.2
0.2
0.1
0.1
0.1
0.1
0.9
0.7
0.6
0.6
0.6
0.5
0.5
1
0.9
0.9
COND
206.85
212.45
1450.5
944
439.4
366.2
291.15
276.65
269.75
1396.5
1492.5
631.9
326.5
239.7
217.2
222.85
837.5
227.5
207.45
198.15
171.5
181.1
175.1
1133
377.35
336.95
313.3
261.6
213.2
204.2
1756
1443
1337
1271.5
1211.5
1070.5
950.5
1968.5
1818
1797.5
CPUE
0.50
0.00
3.75
3.50
2.75
2.50
1.75
0.00
0.00
4.25
2.75
1.00
1.25
0.75
0.00
0.00
2.00
6.00
0.25
0.25
0.00
0.00
0.00
3.00
1.25
0.75
0.00
0.00
0.00
0.00
2.25
0.75
1.50
1.50
0.75
0.00
0.50
2.75
1.25
0.50
Date
18-Oct-06
18-Oct-06
18-Oct-06
18-Oct-06
25-Oct-06
25-Oct-06
25-Oct-06
25-Oct-06
25-Oct-06
25-Oct-06
25-Oct-06
7-Nov-06
7-Nov-06
7-Nov-06
7-Nov-06
7-Nov-06
7-Nov-06
7-Nov-06
21-Nov-06
21-Nov-06
21-Nov-06
21-Nov-06
21-Nov-06
21-Nov-06
21-Nov-06
6-Dec-06
6-Dec-06
6-Dec-06
6-Dec-06
6-Dec-06
6-Dec-06
6-Dec-06
Site
4
5
6
7
1
2
3
4
5
6
7
1
2
3
4
5
6
7
1
2
3
4
5
6
7
1
2
3
4
5
6
7
TEMP
26.1
26.1
25.3
25.5
20.2
18.7
18.45
18.5
18.35
18.25
18.35
18.8
19.4
18.9
19.05
18.9
18.85
19.1
11.9
12.35
12
11.95
11.85
11.5
11.7
11.35
11.75
10.9
10.85
10.2
9.9
10.5
DO
4.625
4.265
3.965
3.58
3.79
0.875
0.74
0.685
0.825
0.81
0.82
6.555
2.23
1.425
1.305
1.395
1.585
1.645
7.64
1.115
1.245
1.39
1.49
1.605
0.94
2.54
0.3
0.25
0.325
0.355
0.335
1.37
85
SAL
0.9
0.9
1
0.75
0.6
0.3
0.3
0.3
0.3
0.2
0.3
0.85
0.45
0.3
0.3
0.2
0.2
0.2
0.4
0.2
0.2
0.15
0.1
0.1
0.1
0.25
0.2
0.2
0.2
0.2
0.1
0.1
COND
1809.5
1790
1929
1475
1026
517
515
509
487
401.25
542.8
1472.5
821.5
547.5
512
454
289.75
399.7
667.5
242.4
241.9
233.1
223.65
208.05
203.1
352.7
250.1
240.3
237.65
228.75
215.9
205.55
CPUE
0.25
0.50
1.00
0.00
1.75
0.25
0.00
0.25
0.00
0.00
0.00
0.75
0.00
0.00
0.00
0.00
0.25
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
BIOGRAPHICAL SKETCH
MattiLynn Delatte was born on May 3, 1983, to a family from Gheens, Louisiana.
After graduating from Central Lafourche High School in Raceland, Louisiana in 2001,
MattiLynn attended Nicholls State University with the assistance of TOPS and several
other scholarships. She also received the award of Outstanding Agricultural Science
Student at the end of her undergraduate career. MattiLynn graduated from Nicholls State
University in May of 2005 with a B.S. in Agricultural Business with a concentration in
Agricultural Sciences. Immediately following graduation, MattiLynn enrolled in the
Nicholls State University’s graduate program for a Master’s degree in Marine and
Environmental Biology. After her first year of graduate school, MattiLynn married her
high school sweetheart and is now the proud Mrs. MattiLynn D. Dantin. MattiLynn’s
graduate studies included research on the abundance and distribution of blue crabs. She
was also an active member and held the office of Vice-President of the Nicholls State
Biology Society, a student-led organization on campus. After graduation in May 2007
she intends to join the workforce in a biological field.
86
CURRICULUM VITAE
MattiLynn D. Dantin
Graduate Student
Nicholls State University
128 City Place Dr. Apt C
Lockport, LA 70374
(985) 228-0359
DelaM952@its.nicholls.edu
EDUCATION
M.S. Marine and Environmental Biology, Spring 2007. Nicholls State University,
Thibodaux, Louisiana, 70310. Thesis title: Distribution and Relative Abundance
of Blue Crab Callinectes sapidus in the Upper Barataria Estuary, Louisiana.
B.S. Agricultural Business with a concentration in Agricultural Science, Spring
2005. Nicholls State University, Thibodaux, Louisiana, 70310.
TEACHING EXPERIENCE
Spring 2007: Teaching assistant for introductory freshman biology labs that surveyed the
plant and animal kingdoms.
Spring 2006-Fall 2006: Nationally certified tutor for the Nicholls State University
Tutorial and Academic Enhancement Center.
Fall 2001-Spring 2005: CCD teacher for St. Anthony Catholic Church religion education
program.
RESEARCH EXPERIENCE
1. Distribution and relative abundance of blue crab Callinectes sapidus in the Upper
Barataria Estuary, Louisiana.
2. Effects of protein content on growth of yearling thoroughbreds.
SKILLS
Boat and trailer operation, pirogue operation, ATV operation, field techniques including
water quality monitoring, crab traps, gill nets, fish identification, live fish
transport, and data management. Tractor operation, plant identification,
transplanting, grafting and maintenance, animal husbandry. Microsoft Word,
Excel, and Power Point, some experience with SAS. Public speaking.
87
LABORATORY EXPERIENCE
Water quality monitoring and maintenance, rearing of live fish.
MEMBERSHIP AND SERVICES
Louisiana Chapter of the American Fisheries Society
Nicholls State University Biology Society – Vice-President
Gheens Chapter of Louisiana Volunteers for Family and Community – Secretary
HONORS AND AWARDS
2007 R.H. “Dickie” and Charlene Barker Excellence in Marine and Environmental
Biology Endowed Scholarship
2006 R.H. “Dickie” and Charlene Barker Excellence in Marine and Environmental
Biology Endowed Scholarship
2006 COMMUNITY CHAMPION-LVFC Volunteers in Service
2005 Nicholls State University Outstanding Agricultural Science Student
88