Cobia presentation

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Sarah Betbeze

7/10/13

Rachycentron canadum

Family Rachycentridae courtesy NOAA

Top producing countries: China and Taiwan Province of China (P.C.)

Taiwan P.C.

Production costs = ~$2.20/kg in 2001

Market value is based on size

 7.7 kg (17 lbs.) or more $5.50/kg in 2004 for whole fish

Taiwan keeps 8-10 kg cobia and sells them whole.

6-8 kg cobia are sent to Japan.

Fillets usually sent to other countries

Other countries where cobia aquaculture occurs:

Bahamas, Belize, the Dominican Republic, Mexico, Philippines, Puerto

Rico, USA, and Vietnam

Egg larva juvenile adult

Spawning season in G.O.M. = April through

September

Every 9-12 days, 15-20 times

Dispense eggs and sperm into the water; fertilization occurs

Larvae hatch ~24-36 hours following fertilization

Day 30 – Juvenile already has markings and coloration of adult cobia

Age during first spawning season

Males ---- about 1-2 yrs old

Females ---- about 2-3 yrs old

Broodstock caught in wild during normal spawning season

Spawning

Can be stimulated in 2 ways:

Hormones

Controlling photoperiod and water temperature www.fao.org

www.lib.noaa.gov

Hatcheries, nurseries, and grow-out cages employed

Larvae raised in “greenwater” nursery ponds

Until day 20

Days 20-45

Introduced to buoyant, pelleted food; reach 2-5g

Days 45-75

Moved to bigger ponds; reach 30g

Days 75-150/180

 www.fao.org

Moved to even bigger ponds or near-shore cages where they reach 1.3-2.2 lbs.

Moved to grow-out cages

13-22 lbs.

Favorite dish: swimming crabs

Opportunistic carnivores

Fish, crab, shrimp, squid

Taiwan P.C.

Feed cobia sinking and buoyant pellets

6 days a week

Blue crab --- naturelssi.com

Squid ---- dpi.nsw.gov.au

Shrimp ----- fishwatch.gov

Cobia ---- seasquaredcharters.com

Dissolved Oxygen

At least 5ppm (mg/L)

pH

When spawning ----- ~7.8

Water temperature

>79 degrees Fahrenheit (26 degrees Celsius)

Pros

Quick growth rate

Good FCR

Fantastic flesh quality

Limited wild population

Can handle a large variety of salinities

Cons

Difficult to obtain trash fish to feed them

Pond cultures have potential to cause water quality problems & excess nutrient loading in the outflowing water

Prone to diseases

Bester, Cathleen. "FLMNH Ichthyology Department: Cobia." FLMNH Ichthyology

Department: Cobia. Florida Museum of Natural History, n.d. Web. 01 July 2013.

<http://www.flmnh.ufl.edu/fish/Gallery/Descript/cobia/cobia.html>.

Kaiser, Jeffrey B., and Joan Holt. "Species Profile: Cobia." Southern Regional

Aquaculture Center, Aug. 2005. Web. June 2013.

<https://srac.tamu.edu/index.cfm/event/getFactSheet/whichfactsheet/180/

>.

Perschbacher, Peter, Dr. "Rachycentridae." Rachycentridae. Aquaculture/Fisheries

Center, University of Arkansas at Pine Bluff, n.d. Web. 06 July 2013.

<http://www.uaex.edu/pperschbacher/Fish/Cobia.htm>.

"Rachycentron Canadum." FAO Fisheries & Aquaculture Department. Food and

Agriculture Organization of the United Nations, 2013. Web. June 2013.

<http://www.fao.org/fishery/culturedspecies/Rachycentron_canadum/en>.

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