c .~.1977/~:1
Administrative Report
International Council for the
Exploration of the Sea
DEMERsAL FISH
(NORTHERN) COMMITTEE
by
R. Jones
Belgium
(R. de ~lerck)
The determination of the density per year class of soles, plaice, dab,
flounder and gadoids along the Belgian coast has been continued on the
RV "Hinders'I
.
Two cruises were carried out for the demersal young fish survey in
collaboration with the Netherlands and Germany.
The market sampling was continued covering cod (~orthsea), whiting (North
sea), haddock (~orthsea), plaice (North Sea - m l i s h Channel Bristol
Channel Irish sea), sole (~orthSea English Channel -Bristol Channel m d
Irish sea)
-
-
-
No. of s a m p l e s
species
season
Sole
-
1
IV
2
research
vessel
-
-
3
4
-
1
VIlf
2
3
4
1
VIIa
2
VIId, e
1
-
Plaice
1
-
IV
2
-
3
4
VIIf
1
1
VIIa
VIId, e
2
-
1
-
,
market
sanlgles
No. of s a ~ i i p l e s
111easured
aged
7
717
210
12
1326
210
12
1447
210
I
1012
210
13
1036
210
5
5
428
210
553
140
9
373
210
4
512
210
9
1078
210
4
210
6
357
348
12
658
150
12
838
150
150
-
u
4 69
140
25
1582
250
5
31 4
150
3
192
-
-
4
228
150
,
fl
Number of samples
species
season
Cod
-
1
IV
2
3
4
research
vessel
samples
-
b
-
6
6
7
measured
aged
327
263
240
2 ti0
270
263
240
260
160
160
Canada
(P. P. ~ e t t )
Sampling data and research activities relative to demersal fish
have been reported to ICNAF.
Denmark
(H. hudsen)
The RV "Dana" took part in the Young Fish Survey in the North Sea in February
and in the International Young Gadoid Survey in June.
Finland
(M. ~ettersson)
No work done on demersd fish other than that reported to the Baltic
Fish Committee.
France
( G . ~efranc)
Travail au Laboratoire
Les reeherches en laboratoire son% surtout orien%4es vers la collecte des
domc5es n6cessaires aux Groupes de travail charg6s de cdculer les prises
maximales autoris6s de mome, de lieu noir, de merlan, dt6glefin,de plie
et de sole dans les secteurs du N,E. Atlantique d6finis pa,r le CIEM; les
donndes recherchdes sont les tonnages d6barque6s par secteur, PQeffor% de
pgche correspondant, les compositions en taille eL en $ges des apports ainsi
que 1Qllabration de c16s %ai~le/&~e,poids/i%ge et de relations taLlle/poids.
Travail en Mer
La " T h d a s s a B h participd en 1976 B deux campagnes qui s O b s c r i v m t dans le cadre
des dtudes intermtionales n6cessaires 8 la connaissance de lQabondancedu
recrutement des nouvelles classes dV&ge, base des estimation de stocks et de leur
gestion rationelle
a) du 11 f6vrier au 2 mars s "International Y o w g Herring Surveyf'
avec collecte de donn6es sur la mome, Pe merlan, lQ6glefin et le
tacaud nom6gien.
b) du ler au 10 juint Inventaire des gadidds du groupe 0 autour des
FBro6s
.
Une prospection des fonds chalutables du seuil Ixlando-f8ringien et du Banc Hatton
avec recherche des concentrations de poissons de profondeur susceptibles dQint6resser
les peeheus franqais a dtd rdalisge entre le PO juin et Be 5 juillet.
-4%--
Merlan (continu&)
I
:
Saison 1976
i
Region
IVc
-
-3
VII
4kme
r-------------
I
I
t
-
/
1
ler trim.
IVa
VIa
VII
i VIIf
1
1
I
I
; 2bme
Vb
,
f VII
3kme
-
31
-
-
1
1
1
1
54
30
50
-
I
11
-
-
2
9
V I ~
I
I
14
1 791
1 446
-
VIIb
i
i
1
VII
, V I I ~i
1
1
-------------T--------7------------7--------------T-----------------.----------------
i
j ma
I
4%me
I
, IVa
ler trim.
I
I
I
I
V I ~
i
I 2Bme
i
I
1
Lieu Noir
I
VII
IVa
4&me
I
Merlan Bleu
'
I
i
j
ma
I
40
I
117
43
1
II
7
-
1 032
-
I
-------------I
Va
Vb
VIa
j
-
123
-
1 75lx)
1
I
I
-
18
40
-
68
-
I
1
2
I
119
207
-
I
I
I
I
2Bme
-
I
92
413
1
2
-
51
1
1
10
VII
I ?&me
-
206
241
1 239,)
766
--
1
I
1
I
I
1rV-b
I
16
I
j
T-------i
Eglef i n
I
;
-
1
I
1
1
I
2
I
-
102
106
3
,
Nombre
dlotolithes
pr&lev&s
687
1
201
In1
9
436
f VII~
1
115
: VIIf
1
230
1 VIIg
I
2
362
T------------T-------------------------------.----------------IVc
VIa
I
Nombre de
Poissons
Recherche
1
3bme t r i m .
'
No. d ( Q c n a n t i l 1 o n s
Wtesu d e
4
338
434
6
5
-
Merlu
VIa
2kme t r i m .
5
-7 z
/
3kme t r i m .
l e r trim.
3
69
VI
I
IVa
.
)
16
1 935
70
I
I
I
I
Lingue Bleue
Grondin -is
Fagtan Noir
Geman Democratic Republic
(w. Mahazke and P, ~rnst)
Sampling Data
Samples of organs of saithe were taken for biochemical investigations
Parasitological investigations of saithe (west Coast of Nomay) and of
1slmd) were carried out.
Greenland Halibut
ff.
ear
Tagging: No tagging experiments were carried out in 9976.
Research Vessel Surveys
Northern North Sea
Northern North Sea
3 Feb
27 Aug
-
31 Mar 1976
- 2 Oct 1976
Saithe, Red-
Gemaqy, Federal Republic o f
(G. ~ a g n e r )
S a m p l i w Data
COD
-
- 10 KADDOCK (ctnd)
1
Area
1
Season
I
3 0 . o f Samples
Research
Vessels
I
lvlarke t
.?lo. of F i s h
Aged
1:Ieasured
Samples
I
I
2acial Invest
- 13 LING
1
Area
Season
C-NOR IVb
I11
I11
FARPL Vb
I11
7
7
7
I11
4
8-NOR
I SC-IR
VIa
LIarke t
Research
Vessels
Samples
of Fish
No.
Bo. of Samples
lleasured
Aged
3acial Invest,
502
30
30
38
.
-
m
*
I11
N-NOR IVa
4
209
Twinq
-,
Area
Season
C-NOR IVb
4
No. tagged ' Type of Fish Recoveries
Type of tags
Red small plastic plates
fixed by nylon thread
-
eels
278
Research Vessel Surveys
Area
Date
Objectives
- 28.
IVa, b
07. 1.
IVa, b
08. 1.
IVa, b, c
04.
IVb
28. 4.
IVb
10.
IVa
08. 6.
IVa, VIa
12.
7.
- 29.
- 23.
- 6.
- 15.
- 11.
- 21.
IVb
21.
7.
- 25.
IVa
26.
7.
-
9. 8.
Distribution pattern of some
important bottom fish species
N a , IVb, VIa
17. 8.
-
7. 9.
Groundfish survey
IV~
19.10.
IBb
15.10.
IVb
30.11.
IVa, Va, Vb
20.
Va
07. 4.
Vb
25. 8.
I, IIa, IIb
15.
3.
5.
9.
7.
1.
Roundfish survey
1.
International Young Herring Survey
3.
Groundfish survey
5,
Gear experiments
5.
Stock assessments
6.
Groundfish survey (inside FLEX)
7.
Groundfish survey
7.
Gear experiments, stock aasessments
- 22.10,
- 3.11.
- 18.12.
- 16.10.
- 15. 4.
- 15. 9.
- 20.
8,
I(
I(
I)
11
tt
I(
Gear experiment on coalfish fishery
and redfish bottom trawl fisheries
Groundfish survey ( redfish)
11
tt
Groundfish survey
11
Iceland
(J. ~agnfisson)
Although the research work in Iceland on demersal species of fish was continued along the same lines as in 1975, there have been some changes in the
emphasis of subjects and facilities in data sampling.
The standard collection of data on landed demersal fish, mainly cod, haddock
and redfish was carried out in various ports.
The research vessel "Bjarni SzmundssontBand "Hafth6rttwereto a great extent
engaged in work on demersal species. Besides that, two commercial stern
trawlers were chartered for 10 weeks altogether. During the year, two branches
of the Marine Research Institute were set up, one in the southeast (~ornafjbrdur)
and one in the northwest (fsafjardur) of Iceland. One was already operating
in the north (~fisavik). Their main tasks are continuous sampling of data
on the various fisheries and species and the tabulation of the data.
In the autumn, the Ministry of Fisheries established a team of movable
fishery inspectors who go on fishing trips on all kinds of fishing vessels.
Through their activities, a considerable additionaz amount of valuable measurements of fish becomes available to the Institute.
The investigation on the distribution of mature cod just before and during
the spawning period was carried out along the same lines as in the three
previous years. The investigation on the immature population of cod was
greatly intensified.
The research pragrammes for haddock and saithe were similar to that for
cod.
The redfish investigations at Iceland were considerably Increased while
the investigations at East Greenland were somewhat diminished except for
the study of immature redfish in that area.
As to other demersal species,, the investigations were carried out in
similar ways as in the previous years. It should be mentioned that;
because of the increasing importance of lumpsucker, its research programme was intensified and regulations as to the control of the lumpsucker
fishery were set up by the Icelandic government.
The special deep sea trawling programme implemented in 1975 was continued
and the research on various deep sea species was intensified.
The number of fish sampled is shown in the following tables.
Sampling Data
Cod
t
Area
No. o f s a m p l e s
Market
Research
Season
vessels
No.
'
Measured
of f i s h
Aged
-
Tagged
samples
87
40
18955
2121
Apr.-Jun.
13 6
29
12307
2616
925
11
Ju1.-Sept.
214
14
36074
2407
559
II
O c t . -Dec.
156
21
21929
3274
1683
Sub T o t a l
593
104
89265
10418
3167
2475
411
377
1507
700
996
Va
J a n . -Mar.
II
XIV
J a n . -Mar.
.- J u n .
23
II
Apr
TI
Ju1.-Sept.
II
O c t . -Dec.
1
Sub T o t a l
38
3
4071
1111
1373
631
107
93336
11529
4540
14
Grand T o t a l
Sampling Data
Haddock
3
89
Sampling Data
Saithe
1
t
No. of samples
Market
Research
samples
vessels
Area
Season
Va
Jan.-Mar.
Apr.-Jun.
3
17
Ju1.-Sept.
0ct.-Dec.
31
23
Total
74
11
II
l1
1
Sampling Data
Area
1
1
3
7
2
12
Measured
No. of fish
Aged
Tagged
656
2657
202
404
294
1513
1481
6307
90 0
Plaice
No. of sijwles
Research
Market
Season
vessels
.-
Measured
No..
-of &sh
Aged
. Tagged
429
913
1015
1448
samples
Va
Jan.-Mar.
22
1865
II
Apr.-Jun.
Ju1.-Sept.
Oct -Dec.
33
101
36
22
6
684
11573
3520
2655
752
Grand Total
19 2
28
17642
4749
TI
II
.
,.
2463
C
Sampling Data
Arpentina silus
r
Area
Season
Va
Apr.-Jun.
If
Jul.-Sept
Oct .-Dec.
II
XIV
No. of samples
Market
Research
samples
vessels
56
62
92
6239
5418
5686
Sub Total
210
17343
Apr.-Jun.
8
32
218
17375
.
Grand Total
h
Measured
No. of fish
Aged
'
Tagged
300
211
482
993
993
*
Sampling Data
Redf i s h
Sampling Data
Roundnose Grenadier
b
Area
No. of s a m ~ l e s
Market
Research
Season
vessels
No. of fish
Measured
Aged
samples
Va
Apr.-Jun.
9
862
II
Ju1.-Sept.
Oct.-Dec.
7
64
603
5452
Sub Total
80
6917
,XIV
Apr.-Jun.
I 11
Oct.-Dec.
2
8
8
1409
Sub Total
10
1417
Grand Total
90
8334
1
II
10 0
10 0
652
852
---------------------,--------------..-----------------------------------
852
-
Sampling Data
Area
Roughhead Grenadier
Season
-
No. of samples
Kesearch
Market
vessels
Va
11
Apr.-Jun.
Oct . -Dec.
No. of fish
Measured
Aged
samples
25
488
25
66
228
Sub Total
50
554
----------------------.-------------------------------------..-----------
228
XIV
Apr.-Jun.
37
1890
174
11
Ju1.-Sept.
Oct . -Dec.
9
12
670
508
143
102
Sub Total
58
3068
419
10 8
3622
647
I1
---------------------,-------------------------------------..-----------
Grand Total
I
I
-
Sampling Data
Blue Ling
b
Area
No. of samples
Research Market
Season
vessels
iVa
11
II
No. of fish
Measured
Aged
samples
Apr.-Jun.
Ju1.-Sept.
40
1405
119
33
1017
111
Oct. -Dec.
100
1805
227
Sub Total
173
4227
457
-----------------------------------------------------L---------
XIV
Apr.-Jun.
11
I1
18
586
Ju1.-Sept.
7
172
Oct . -Dec.
12
82
82
Sub Total
37
840
82
210
5067
539
-----------------------------..---------------------------------,-
Grand Total
.
--
Sampling Data
Area
-
Greenland Halibut
No. of samples
Research
Market
Season
vessels
Va
Apr.-Jun.
II
Oct . -Dec.
i
Measured
No. of fish
Aged
57
1929
17
13 1
400
74
1----------.-----------------------Sub Total
2060
-----------------------------------
II
10
,
14
537
397
3526
I
----------
I
Apr.-Jun
Oct . -Dec.
Tagged
sarnpies
1
XIV
-
2 00
"O
200
3526
1;
Sub Total
24
9 34
400
------------------------------.---------..----------------------------------
-
Grand Total
98
299 4
800
3526
-
Sampling Data Various Species
Area
No. of fish
Measured
Aged
No. of samples
Research Market
Season
vessels
Tagged
samples
Catfish (A. lupus)
Jan. -Dec .
Va
5
Va
18
1
Mar. -Dec .
1
9 1 3
Apr .-Dec.
I
9
1
Jan.-Dec .
304
2481
2064
-
-
1
out (Trisopterus esmarki)
Halibut (H. hi
Va
5299
Spotted Catfish (A. minor)
Norwa
Va
1
2517
1034
-
o lossus)
/L1
870
928
18
Others
Va
Mar. -Dec .
Sampling. Data
Lumpsucker
158
-
.
1557
225
( ~ g c l o p t e r u slumpus)
C
Va
II
II
Jan.-Mar.
Apr.-Jun.
Ju1.-Sept.
3
31
2
36
3
11
220
701
1867
58
14
921
1925
9
Ireland
(J.P. Hillis)
Cod, haddock, whiting, plaice and sole were sampled at the port of landing
as shown in the following Table. Approximately 200-250 otoliths were taken
from larger measured samples per area per quarter. Small scale studies on
discards were carried out at Killybegs (vI~).
Plaice
Routine spring and autumn beam trawl surveys for your plaice were
carried out off the east coast.
Sampling Data
Species
( a l l market)
II
cod
1
2
I
4
VIa
i
I
VIIa
1,
1
2
3
1
I
!
I
VIIb, c
I
1
10
12
11
12
I
i1
I
1
I
583
6
580
84
5
1
114
60
437
3
16
1
2
/
7W
109
4
I
6
12
2
2
1
2
iI
854
1
2
3
VIa
562
478
498
12
Z
Haddock
-
4
J
VIIg-k I
No. of fish
measured
No. of smples
Season
Area
188
121
780
1w
3
13
5
4
8
1
2
3
3
2
2
3
188
204
251
102
2
3
2
1
7
148
189
185
3
5
607
175
208
946
3
1 345
3
3
627
1 038
2
691
6%
792
I
VIIb,c
I
!
I
1
VIIg-k
Whiting
VIIa
I
I
i
j
j!
4
I
I
I
1
2
3
!
1
1
1
4
1
2
3
4
,
continued
Netherlands
(J.F. de ~een)
Work at sea
The R.V. "TridensI1 made 11 cruises in the area of the Committee of which 4 were
mainly devoted to work within the scope of the Demersal Fish (~orthern)Comittee.
The corresponding numbers of cruises of the R.V. 'Willem Beukel~z~~
were 11 and 5.
ThenWillem Beukels~'~
made its last trip in August and was taken out of service.
The R.V. "Stern" and the R.V. "Schollevaartlmade together 25 cruises devoted
to demersal topics in the estuaries of the Netherlands.
The R.V. "Stern", R.V. llSchollevaarl',
R.V. 'Willem Beukelsz" and R.V. "Tridens"
made one joint cruise in April and with the exception of the 'Willem Beukelsz",
the other ships made a joint cruise in October to analyse the stocks of juvenile
sole, plaice, dab, flounder, gadoids, brown shrimp and other organisms in the
nurseries of Belgium, Holland, Federal Republic of Germany and part of Denmark,
in cooperation with Belgian and German research vessels.
The R.V. 'Willem Beukelsz" made one cruise in May to the eastern part of
the Irish Sea to analyse the stocks of juvenile fish there.
Work on fish
Plaice
-----The stock analysis by means of market sampling from different sub-stocks
in the North Sea was continued with the emphasis on the first quarter in
the spawning season. Analysis of the catches of young fish cruises
( ~ ~ r iand
l ~ctober)in the Southern and Central North Sea continental
coasts showed that the 1975 year class is above average and the 1976
year class good. Discarding of plaice was studied together with the
survival of discarded plaice.
Sole
---The stock analysis by means of market sampling from different localities
in the North Sea and the Irish Sea was continued. In addition, the
stock in the Gulf of Biscay was sampled for stock analysis.
One cruise was devoted to the Irish Sea for census purposes.
Analysis of the catches of pre-recruit sole in the Belgian, Dutch and
German coastal areas showed that the 1975 year class was better than
estimated in the preceding year and the first estimate of the 1976
year class was good. The 1974 year class estimated in 1974 and 1975
to be below average turned out to be poor on recruiting to the adult
stock.
Discarding of soles was studied and their survival from discarding.
--
Dab
No stock analysis through market sampling is possible because of the fact
that landings do not reflect catches. Discarding at sea is high and
sometimes all dabs caught are discarded.
During the April and October young fish cruises the age structure of the
dab population in the nurseries and at sea has been analysed. 10 400 juvenile
plaice have been tagged in different nurseries.
Cod
--The analysis of cod stocks by means of market sampling was continued.
Cod, Haddock, Whiting
.....................
The R.V. "Tridensl'participated in the ICES Young Fish Surveys in February
for estimating abundance of I-year old gadoids and in June for
estimating 0-group abundance of gadoids during the pelagic phase.
__________-_--------------------------------------------------------------
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.d
u
3
k
cd
II
11
)I
II
II
11
I1
I!
II
I1
II
(d
a
cd
II
II
II
II
I1
I1
iI
31
II
ll
11
31
I1
bI
11
II
I1
II
II
11
I1
1976
Sampling data for Saithe.
..............................
Area
No. of samples for
age determination only
Season
research
vessel
1st quarter
IV
2nd
11
3rd
11
4th
11
-
-
market
Number of fish
measured
aged
9
4
3
579
455
227
228
190
150
3
4.52
145
racial investigations
1.486
19
940
------------------------------------------------------------------------------------------------------------=
............................................................................................................
Total annually
-
Sub-areas I m d II
The m J o r roundfish species were sampled on approximately the same scale
as in 1975. Tknese &%%a form the basis for the stock assessment programmes
of Arcto-Norwegian cod m d haddock, and saithe, They are used to provide
forecasts for the Norwegian fisheries and to make assessments at ICES
Working Groups,
The distribution m d abwdmce of young cod and haddock were sixdied with
research vessels in the Bax-ents Sea in J m u q - F e b ~ a ~ ,In February-Wch
the concentrations of m % u e Arcto-Norwegian cod were chmted in Lofoten.
In August-September the annual InternationdO-group s m e y was carried out in the
Barents Sea and adjacent waters, and in October the distribution and abundance
of cod and redfish in the area of Bear Island - West Spitsbergen were studied.
Tagging experiments of the major rowdfish species continued, In March
mature cod were tagged in Eofoten, In h e y o m g saitlze were tagged in the
southern part of Division IIa, In August, codn hddsck and aaithe were
tagged in the coastal waters of northern Nomay, and in October cod were
tagged in %he area Bear Islad-West Spitsbergen,
The abundance of 0-group saithe in the littoral zone was studied at
selected localities along the Norwegian coast in September, Magket sampling
of Recommendation 4 species from Division IIa continued,
Sub-area IV
Ladings of Recommendation 4 species in the Recornendation 2 fisheries
from Division a[TTa%ere more extensively sampled that in previous years,
!!?he sampling programme gives estimates sf relative abundance of the
different dpecies Smded and biological data for %hemost important species,
Distribution and abundance of I- and 11-group gadoida in June, as part of
international surveys, The influx sf 0-poup blue whi%ing was investigated
in November-December,
7
I
30
I
RESEARCH VESSEL
SPECIES
AREA
MARKET
'
No. of
samples
No. of f i s h
Aged '.Measured Tagged
'
No. of
samples
No. o f i i s h
Aged Measured
Haddock
IVa
,
IVb
1
80
223
2
21
-
287
3
17
-
161
4
21
-
163
1
27
354
1
80
2
21
3
17
-
4
21
-
28
1
27
-
46
1
80
361
827
2
21
3
17
-
4
21
1
1
2 908
1 345
-
152
-
-
184
-
47 0
-
136
-
-
-
152
-
-
184
-
300
-
158
2 280
2 065
-
Saithe
IVa
IVb
282
56
-
136
-
205
-
-
-
152
-
-
184
-
160
158
-
685
158
687
Whiting
IVa
IVb
95
23
-
-
-
136
-
2 128
27
130
1 053
-
-
-
-
-
-
-
16
507
-
-
41
-
-
152
158
-
N o r w a y pout
IIa
IVa
IVb
2
-
-
3
-
-
4
-
-
-
1
80
125
3 258
2
21
100
409
3
17
50
290
4
21
75
990
-
136
-
5 737
1
27
30
216
-
-
-
-
1
-
-
-
42 0
41
-
2 057
3
16
-
16
2
-
34
-
11
546
4
-
-
-
1
80
-
321
152
2
21
3
17
83
-
-
158
-
392
-
136
-
11
21
184
-
400
105
1 028
5 730
7 505
7 355
Blue whiting
IIa
IVa
\
4
21
-
156
21
184
804
2 651
7 365
3 094
1 471
1
b
MARKET
RESEARCH VESSEL
I
r
SPECIES
AREA
a)
m
IF
No. of
No. of
samples fish
No.\of
No.of
sample
No.of
No. of
samfles fish
No. of No. of
samples fish
-
-
-
-
-
-
-
-
2
202
-
-
-
-
-
-
-
-
-
-
1
99
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
2
200
2
431
2
1
100
3
-
-
2
2
189
-
1
-
-
2
98
3
-
-
1
46
IIa
3
12
4
-
4
In
-
1
1
IVa
1
1
57
2
-
-
-
VIb.
Tagged
-
2
VIa
Measured
Aged
Measured
Aged
-
Norway
pout
I
-
3
1
51
1
-
2
3
4
27
7
270
-
4
267
4
-
-
28
2422
-
1
-
-
2
10
-
3
-
-
1
3
-
-
-
7
211
-
2
6
-
-
-
-
-
Blue
whiting
I
3
IIa
3
4
IIb
Silver
smelt
I
I1a
Sandeel
I
3
IIa
3
-
-
-
I
-
-
Sampling Data for Cod, Haddock, Saithe, Whiting and Blue Whiting
Poll%ugal
(M, de Lomdes Masecos)
Pendant lPannde de 1976 le Ddpartement de Pgches et Reasowces (ex-hstitut de Biofsgie
Maritime) a poursuivi le propamme d 6chantillormage de la mome (~aclusmorhua)de NEAFC
p o w I%tude ae Pa composition des tailles, Ees pofssons snt 6t6 mesuds 3, bord
dvun bateau de pgche. Les donndes qui se r6fkrent aux QchmtiSlons ssnt prQsent6es
d m s le tableau ci-desssua :
Spain
(0. ~endrero)
Nothing to report for 1976.
Sweden
(G. ~tterlind)
Swedish investigations have been confined mainly to the Baltic and have
been reported to the Baltic Fish Committee.
United Kingdom
1. England and Wales
(A.c. I3urd)
COD
Area
p
p
p
p
p
Arctic 101+102+113
Iceland 1 1 1
Greenland 114
Fame 105
North Sea 104
Westerly 106A
Irish Sea lO7A
Rockall 106B
Bristol Channel lO7F
S.E. Ireland 1076
E. Ebgliah Channel lO7D
W. English Channel 107E
(Z'REam) Arctic
101+102+113
No. of samples
No. of fish
Research
vessels
Measured
Market
samples
Aged
Racial
invest
HADDOCK
Area
No. of samples
No. of fish
Research
vessels
Measured
Arctic lOl+lO2+ll3
Iceland 111
F a m e 105
K a ttega t/~kagerrak 10 3A
North Sea 104
Westerly 1068
Irish Sea 107A
Bristol Channel 107F
S.E. Ireland 107G
Rockall 106B
(FREEZEX) Arc tic
130
162
---
2
22
11
934
1
509
43
48
3
Aged
28170
30862
7942
244
681 62
8822
3068
30 3
127
71 56
44
101+102+113
Area
Market
samples
1126
806
49
-
91 9
839
299
-
142
-
No. of samples
No. of fish
Research
vessels
Measured
Market
samples
Arctic 101+102+113
Iceland 111
F'aroe 105
North Sea 104
Westerly 1068
Rockall 1063
(FREEZER) Arctic
Aged
-
-
Racial
invest
Racial
invest
450
1240
432
628
580
31
57
20
57
62
6
34
101+102+113
104
PLAICE
Area
Arc tic 101+102+113
North Sea 104
Westerly 1068
Irish Sea IOTA
Bristol Channel lO7F
S.E. Ireland lO7G
E. Znglish Channel 1070
W. English Channel 107E
No. of samples
No. of fish
Research
vessels
Measured
Market
samples
33
428
Aged
-
367 5
62
2060
191
125
824
1599
Racial
invest
WHITING
Area
No. of samples
No. of fish
Research
vessels
Measured
Market
samples
-
Racial
invest
-
-
2
472
Faroe 105
North Sea 104
Westerly 106A
Irish Sea lO7k
Bristol Channel 107F
S .E. Ireland 1 0 7 G
5. English Channel 107D
W. English Channel 107E
Aged
1138
50
1379
4
138
11
76
3
50
24
106
556
-
SOL
Area
:in.
of samples
Research
vessels
Plarke t
No. of fish
iileasured
Aged
samples
Racial
invest
North Sea 104
Irish Sea IOTA
Bristo1 Channe 1 107F
S.Y. Ireland 10712
Westerly 1068
E. ihglish Channel 107D
W. Ebglish Channel lO7E
m
T
Area
No. of eamples
No. of fish
Research
vessels
Heasured
Market
Aged
sample8
bcial
invest
North Sea 104
W
N SOU
Area
.
No. of samples
Research
vessels
W. English Channel 107E
Bristol Channel 107F
Yiarke t
No. of fish
Measured
Aged
-
samples
172
14724
5
687
499
-
Racial
invest
HBI(E:
Area
No. of samples
No. of f i s h
Research
vessels
Measured
North Sea 104
Westerly 1 0 6 ~
I r i s h Sea l O 7 A
B r i s t o l Channel 107F
S.E. Ireland 107G
Market
samples
5
59
65
47 2
Aged
-- ---
10025
8129
7
1305
4
735
Racial
invest
-
SPURDOG
No. of samples
Area
Research
ve~sels
North Sea 104
Westerly 106k
Plarke t
samples
No. of f i s h
Measured
Aged
-
113
91 96
46
4647
Racial
invest
-
SKATES AND RAYS
Area
North Sea 104
Westerly 1068
I r i s h Sea 1078
B r i s t o l Channel 107F
S.E. l r e l a n d 1 0 7 ~
No. of samples
1Jo. of f i s h
Research
vessels
Measured
Market
samples
46
26 50
31
159
12
10
3200
17143
1631
1613
Aged
-
Racial
invest
--
Release of English tagged f i s h i n ICES areas during 1976
Species
Plaice
Sole
Lemon s o l e
Rays
Cod
Haddock
Whiting
Bass
Turbot
Brill
spurdog
Total
Region
Total
2, Scotland
(R,
ones)
Scorttish research vessels worked at Faroe, in July, and participated in the
International Young Herring Survey in the North Sea in February. 0-group
gadoids were sampled pelagically in the North Sea in June.
Routine monitoring of the abundance and composition of the major roundfish
and flatfish species was continued as in previous years, the data being
obtained by sampling at the principle Scottish trawl and seine net ports.
At the request of ICES, discarding by commercial fishing vessels was
investigated, Thirtyfour trips were undertaken, 26 aboard seine-net
vessels and 8 aboard trawlers.
W i n g 1976 sampling of commercial landings of Nomay pout and sandeels was
carried out, In addition, information on the relative abundanae of these
species was obtained on research vessel, surveys.
Tagging of the pajor round- and flatfish species has continued with emphasis on
tagging in offshore North Sea waters,
Aquarium studies have continued on the efficiency of conversion of food into
growth and reproduction in gadoids,
The numbers of fish measured and aged in 1976 are s h a m in the table on
the following page.
U,S,A.
(B,E. Brown)
Sampling data and research activities relative to denersal fish have been reported
to ICNAP,
U, S,S.R.
(P.A. ~oiseev)
In 1976, as in previous years, data were collected to characterise the abundance,
age-length composition and distribution of cod, haddock, Polar cod, redfish,
Greenland halibut and other bottom fish in %he ICES zone. The figures in the
following tables show the volume of data collected by areas, Samples were
collected on board the research and scouting vessels; no racial investigations
were made,
Investigations towards refining the assessment of the state of the main commercial
fish were continued, both by means of the young fish determination and estimates
of absolute abundance. The survival conditions of young fish at different stages
of development were studied; ichthycbpl&%on
was gathered and analysed; fisheries
forecasts for different periods were compiled; the forecasting technique was
improved,
In 1976 the research activities were continued in %he North Sea to study the
abundance, dynamics and the state of the gadoid stoeks,
In spring 1976 a trawling survey on abundance of different gadoid year classes
was made. The distribution was studied and the age structure determined. The
collection and treatment of material on the biology of haddock, whiting, pollack,
cod, blue whiting and Norway pout were continued, Ecological surveys were made,
aimed at investigations of %he influence of Bnviromental factors on abunde1;ce of haddock
year classes. In July-August, a trawling s m e y 05 %he abundance of O-group
gadoids was conducted,
In 1977 the research will be progressing m d e r the same programme.
-
43
-
Sampling Data f o r Cod
t h e southern
Barents Sea
the northweste r n Bsrents
the nortnwest
1
Sampling Data f o r Haddock
- 44 Smnpling data f o r r e d f i s h
*
4
Area
t h e southern
Barents Sea
t h e nortiiwestern
Barents Sea
the northwestern
c o a s t o f Norviay
East
Greenland
the Faroe
Islands
Season
I
I1
I11
IV
I
I1
I11
IV
I
I1
111
IV
I
I1
111
IV
I
I1
I11
IV
P?o. o f
samples
-
NurriDer o f f i s h
lideasure d
Age d
,
19728
1a33
I
21664.
2809
252
2
12143
9
20357,
7
40112
604
2222
1800
I
19173
298
b
-
-
'33-3
3
0729
-
50
-
-
-
-
3
75498
3
14583
-
-
-
-
-
100
-
824
-
-
-
29
-
-
-
-
--
-
45
-
Sampling Data for Greenland Halibut
4
Season
Are a
Number o f f i s h
ITo. of
samples
'
Xe nsure d
Aze d
,
1
I
I1
I11
the s o u t h e r n
Barents S e a
I
the n o r t h ~ ~ e s t e r n
Earents Sea
the northwestern
coast- of ETomny
-
IT7
-
I
I1
I11
IV
I
I1
I11
IV
Sampling Data for Saithe
1048
309
62
.-
-
107
-
-
107
-
-
467
-
-
-
-
589
13896
5
4
-
L
-
C
-
-
Sampling Data f o r P l a i c e
b
Area
Season
: Isain2les
T'
,
the southern
Basents Sea
I
I1
4
1
I11
IT
,
Number of f i s h
nleasure d
Aged
3
2899
911
2597
458
2
732
227
493
21 9
- 47 Sampling D a t a for C a t f i s h
t h e southern
Barents S e a
the norti-svest-ern
Barents Sea
the norti1v;estcr.n
coast o f Norsvay
Sampling D a t a , 1976 ( ~ o r t hs e a )