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International Council for the Exploration of the Sea

CM 1978/G: 10

Demersal Fish Committee

THE RESULTS OF THE INTERNATIONAL ·a-GROUP GADOID SURVEY IN THE NORTH SEA, 1978

by

To Benjaminsen

Institute of Marine Research, Bergen N. Daan

Netherlands Institute for Fishery Investigations, Ijrnuiden

I NT HODUCTION

J.R . G . Hislop

Marine Laboratory, Aberdeen M.J . Holden

Fisheries Laboratory, Lowestoft J. Lahn-Johannessen

Institute of Marine Research, Bergen W.G. Parnell

Fisheries Laboratory, Lowestoft

The survey was carried out in the period 11 June - 11 July by 4 vessels, CORELLA (England), EXPLORER (Scotland), JOHAN HJORT

(Norway) and TRIDENS (Netherlands) . The gea rs used, the design of the experiment and the method of fishing were all as described for the 1976 survey by Daan et al. (1976) .

RESULTS

Area fished

The statistical squares fished by each vessel are shown in Figures 1 and 2. Because all the ships were not available during the same period and because the JOHAN HJORT had to carry out a mackerel egg and larval survey at the same t ime as the 0-group gadoid survey, the time interval between sampling each statistical square v aried from a minimum of 1 day to a maximum of 19 days.

1'wo statist.ical squares (49E9 and 45E8} were fished three times

and one square (42E7) only once.

- 2 -

For ·this reason, the average numbers per haul, mean le ngth ,

stand ard deviation and r ange for all species by groups of 4 sta- tistica l rectangles were calculate d by one week periods (Tabl es 1- 4) ..

Distribu-tion

The numbers of 0-group ga.doids caught in each statistical square are shown in Figures

3-7~

Cod were found in three main areas, off the Danish coast, to the southe ast of the Shetlands and in the Moray Firth/Orkney region.

The area of highest abundance was off the Danish coast. Cod were scarce along the English coast.

Had~.ock

were present in moderate numbers east and south-east of the Shetlands and of f the Danish coast. These are the two areas in which the abundance of haddock has been highes t in past surveys.

However, in 19 78 haddock were unusually abundant to the west of Fair Isle and around the Orkneys, the catch rates in these areas being as high as · those in the area east of the Shetlands. Compari- son of the catches made in the Orkney area during the first and second times of sampling shows that the distribution of the fish changed. This suggest that there may have been an influx of a-

group haddock to the North Sea, possibly from a spawning area to the we st ..

YJhi

t_l!~

were found main ly to the we st of Fa ir Isle and the Orkneys and off the Danish coast. Over the rest of the survey area catches were small , with the exception of a single large catch (636 fish)

i n rectangle 50F3 (Fig. 5).

Norw~olt!:

were restric·ted to the area betwe en the Shetlands and the Norwegian Deeps, except for a single large catch (2280 fish) made in 47E5 (Fig .

~) ^o

Sa i the we ,:c scar--e, as s usual: and were distributed mainly

~f + h~ nrr+~arn

North SPa (Fig. 7).

- 3 -

Predic tion

of_y_ear~class

s i ze

Examin ation of the ca t ch-rates for the 3 standard areas (Danish Coast, English coast and Northern area, (see Fig. 1) showed that there were statistically significant differences between the first and se cond times of fishing for all species and areas, excep t haddock in the Dan ish Coast area (Table 5). However, to get an average value to use as an index of year-class abundance, results from both surveys were combined, using the standard areas for each species shown in Fig. 3-5 for cod, haddock and whiting respectively. The results are given in Table 6.

Compared with previous years, when the main distribution of

haddock was east of the Shetlands, 1978 haddock were also around the Orkneys (Fig. 4). As this region of high density includes recta ngles which have not been used in previous years in calcula- ting the index of haddock abundance, i t was decided that a mean bas ed on the whole of the Northern area would provide a better index of abundance for year to year comparison of year-class size. Data for previous years (1974-77) were re-calculated on this basis {Table 7). The mean abundances for Norway pout, which have not previously been given for 1974-77, were also calculated on this basis .

The mean abundances of cod , haddock, whiting and Norway pout by standard area s are shown in Table 8 together with the indices of abundance of cod, haddock and whit ing f om the Interna tional You ng Herring Survey

(A~1on,

1978a) and the estimates of year- class size from virtual population analysis (Anon. 1978b).

Since the 1978 North Sea Roundfish Working Group entered an esti- mated recruitment figure f r om the I'HS fe r the 1976

year~class

in the ^?Ar the data

ser~es

of independent VPA e stimates for com- parison has no·t been c.A 'tended f _ 0m last. ve a.r. Becaus e the number of data st::t.s

.1.:.::: :irn~_:..:e:

1 ,

rcgrcs~'~,c:~

a1 oly.--c::·

vJ(~l.e

not d o ne. The da ta in Table 8 indicate t h at the 1978 year-c las se s of cod, had,Jcc

c)!Yl ~ihil-.t!HT

arr-:

bel~:' ·1"J(~r:=~r:r~. Ti'l(~

di·--tri..but ion of cod

nd

li 1 , \...-

J: )

^{t -}

t

¹

are<-1,

l

t

^t

i r ,, b1tndance 1n,ty be very

~i

ow.

- L1 -

P l a nning of

fu~ure sur\:.~.Y§.

Th e group agreed that the dates f o r the 1979 surv ey shou l d

b~

simi lar t o those of 197 7 -78 . Howeve r , i n view of the at y pi ca l distribution of 0-group h a dd o ck i n 19 78, i t wa s c ons id e red tha t i t would be v ery desirable to e xtend t h e area of the survey to inc l ude statist'cal squ ares i n the no r th M i nch and t o the north of t h e Outer Hebrides and a l so to increase the number of squares sampled off the D anish c o ast. However, i t would be necessary to i ncr ease the number of ships in the survey to do this because the area samp le d n ow i s as large as is possible with the 4 ships

curre nt ly committ e d t o th i s survey.

By - catch d ata

The catches of herring , s prat and sandee l are given i n Tables 9- 1 1. These a n d b y -ca t c h data for other species wi l l b e fu lly reported in Annales Biolog i q ues .

REFERENCES

ANON , 1 9 7 8 a e Compi l a t i n of the gadoid data co l lected during the Interna t ional Young Herr i ng Survey 1978. Coun.

Meet . int. Coun. Exp l or. Sea, 19 7 8 . ( G: 51) [ Mimeo.]

ANON . 19 7 8 b. RE:' port of t h e No r th Se a Rou n df ish \"larking Gr oup.

Cou~_:__M~~int=

Co un . EXJ?.l o r . Sea , 1978. (G : 7 ): 1-89 [ Mimeo.]

DAAN, N. ,

HISLOP,

J-&R.G. , HO.LDEIJ,

.f\ 1.J . ,

"PA.RNELL, W.G.,

KNU DSEN, H.

and LAHN-JOHANNESSEN,

J ~

19 7 6. The results of t h e interna tio nal 0-group gad

^{~ ·d}

survey in the North Sea, 1 9 7 6.

Co~~:__}"eet

i :rr ..

~( -..::~_ Ex;'lo~,~-2-. r1.,

19 7 6 .

(F': 1? ) : 1-4. 4 ta b., 9 fig.

~!llimeoA ]

able ~. -=.· . ..._ ~ · _·ates. met:.rl lengt.us (ern), st2.ndard c.e,·iations and ranges of lengths by species and blocks of 4 statistical rectangles; 11-19 June 1978.

lock J_J;-te

)_4' F.1 .L - .L ~ • \ )

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3-47 FO-! 15, ';, ~7. J l q/ ' 3-47 F2-1 !:_:, )-45 E6-7

19/r)

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)-45 E8--1 - , .8, l9, )-45 FO-. 18, i:;

l-43 Eo-7 Jt.:l/(,

!-43 E8 -9 17, 13/6

~-43 F0-1 1Sjo

!-43 F2-3 !5/

~-41 ES-7 le, 17'6

~-41 E8-9 !6, 1 7 I 6

~-41 FG-1 1'5/6

~-41 F4-5 11. '~

~-41 F6-7 13,14/6 J-39 EB-9 14,

:s /6

l-39 F0-1 14 15/6 1-37 E8-9 12. l4/6 1-37 FO-l 13;6

:'\NISH COAST NGLISH COAST :::OTTISH COAST ORWEGI.AN DEEPS

J

c

C, .;, T

J

c c

T T

c

c

c

T

c c c c

Cod Haddock Whiting

N J::/hr

r

^{Sd R}ange N N/hr

L

Sd Range N N/hr

L

Sd Range 5 3 3.95 0.97 2.0-4.9 214 107 4.37 0.96 2.0-7.4 0

<(l 3.75 - 3.5-3.9 57 14 4.23 1.14 2.0-6.9 1 <:1 4.25 4.0-4.4

0

2 2-

2 3.75 - 3.5-3.9 3 3.2.7 0.65 2.0-5.4

114 29 4.39 1.26 2.0-7.9 15

466

15 3.88 0.81 2.5-6.4 8 3.37 0.81 2.0-7.4 56 !4 4.C•9 0.57 3.0-5.4 179 45 4.50 1.21 2.0-7.9

9 25 2..

0 -±

16 3 17 0 0 408 226 0 0 3 0

2 3.92 0.94 2..5-5 4 13 3. 67 0. 75 2. 0-4 9 .(1 2.75 0. 712.0-3.9

2 3. 25 0. 71 2. 0-3. 9

<

1 4. 25 - 4. 0-4. 4

- 3.00 0.41 2.0-3.9 2 2. 58 0. 58 2. 0-3. 4 9 2.81 0.56 1.5-3.9

102 3. ':!4

0.

59 l. 5-5 4 57 3.58 0.46 2.0-4.9

1 2. 25 2.0-2.4 64 12 85 9 0 56 190 0 2 0 0 21 115 0 0 0 0

16 4. 80 1. 28 2. 5-7. 9 6 4. 00 0. 81 2. 0-4. 9 17 3.90 0.54 2.5-4.9 2 3.25 0.43 2.5-3.9

1 4 3. 78 0. 7 4 2. 5 - 5. 9 48 4. 0 3 0. 8 4 l. 5 -5. 9

2.25 - 2.0-2.4

5 l. 9 4 0. 40 l. 0- 2. 9 29 2.97 0.87 1.5-5.9

0

4 4 3.63 0.48 3.0-4.4

< l 5. 25 5.0-5.4

5 4.45 0.84 3.0-5.4

3 3. 75 3.5-3.9

21 11 3. 37 0. 44 2. 5-4.4

<

1 3. 25 3.0-3.4

0

4 2 3.50 0.29 3.0-3.9

0 0

<1 2.75 - 2.5-2.9

2 14.25 0.71 3.5-4.9 0

0

5 1 2.95 0.97 2.0-4.4

0 0 0 0

<1 5.25 - 5.0-5.4

Saithe Norway Pout

N N/hr

L

Sd Range N N/hr L Sd Ran~- 0 6 148 3 0 7 4 3- 16 0. 54 2 . 0 -5 . 4 10 3 3. 75 1.15 2. 5-6.4 3045 761 ' 3. 06 0. 47 2. 0-4.4 316 79 3.51 0.46 2 5-4.9 5029 1257 3.73 0.57 2.0-4.9

0

3

11 2

0

0 3 2 0 0 0 0 0 0 0 0 0

6 6 3.33 0.38 2.5-3.9.

<

^{1 5}. 25 5. 0-5.4 14464 1808 3. 95 0. 55 2. 0-5.4

4. 25 0. 87 3. 0-4. 9 21951 5488 3. 95 0. 72 2. 0-5.9 3 3. 52 0. 34 2. 5-3.9 19245 481! 3. 60 0. 45 2. 0-4.9

5.25 0.714.5-5.9 0 4. 75 4.5-4.9

5 . 7 5 - 5.5-5.9

4.92 1.15 4.0-6.4 5. 00 0. 35 4. 5-5. 4

32

0 1 0 2 0 0 0 0 0 0 0 0 0 0

6 4. 50 0. 49 3. 0-5. 4

4.25 - 4.0-4.4

l 3.25 0.71 2.5-3.9

634 20 64 85

3. 75 0. 56 l. 5-5.4 136 2.73 0.55 1.5-3.9 2 3. 49 0. 74 2. 0-5.4 848 3. 81 0. 75 2. 0-5.4 613

2.81 0.90 l.0-5.9 6 3.33 1.28 2.0-5.4 0 ₀

0 5. 25 0. 50 4. 5-5. 9 20651 3. 54 0. 53 2. 5-6. 4 492 72 2.25 - 2.0-2.4 2

3.72 0.92 2.0-7.4 32 4. 32 l. 14 l. 5-7. 9 9

4.25 0.71 3.5-4.9 0 3.42 0.45 2.5-5.4 5 4. 1 9 0. 6 8 3. 0 -5. 4 3 45

3. 72 0. 66 2. 0-5. 4 3. 74 0.64 2.0-5.9

able 2. Cat:r .r>tes, mean lengths (en:,), standard deviations and ranges of lengths by species and blocks of four statistical rectangles, 20-26 June 1978.

lock

) -49 £'3 -·- )-49 F()-,

-~-~-

.:...\.1

Ships

E T 1-47 E4-S ::..? C

:-47 £6-7 Zl

c

~-47 F0-1 2C 21 T

>-45 £4-5 :;:

c

>-45 E; -7 ! 1 -· C i-45 :ES -Ci ;:_ . U, T

~-45 FO-l J-45 F2<~

l-43 E8 _o l-43 FO -l l-43 F2--' :-41 £6-- :-41 E8--0 1-39 E::l-9

·-37 ES-9

·-37 FoJ-1

21 r Z.Z:

·r

')I).? l J

T

~.J

c.

J

) ·!

~ 6

rr

2.6 T

24

c

~5, 2{)

c

2~,2.l.

\l"GLISH COAST

~OTTISH COAST )R WEGIAN DEEPS

Cod

N N!hr

L

Sd Range

4 4 4.00 0.29 3 5-4.4 44 ~l 4.03 0. 61 2 0-4.9 10 10 4.10 0.58 3.0-4.9

7'-r 25 3. 53 0 55 2 5-4. 9

263 66 4. 33 0. 78 2 5-6.4 12 12 3.54 0.50 2..5-6.4 14 7 3.36 I) 59 2.5-4.

2.75 - 2.5--2.9 q ? 3. 92 0. 66 2. 5-4. 9 3 4.65 0 39 4.0-5.4 3. 25 0. 00 3. 0-3.4 5 l 3.45 0.27 3.0-3.9 l 4. 25 4.0-4.4

40 l 0 3. 7 9 0. 8 6 2. 0 -4. 9 7. 3. 04 0, 57 2. 0-3. 9

tl. l :>.. 63 ).63 1 5-3.4

(!

Haddock

N N/hr L Sd Range 178 178 3.32 0.45 2.5-6.4 1529 382 4.20 1.13 1.5-8.9 108 108 4. 46 l. 04 2. 0-8.4 ::.10 70 J. 46 0. 96 l. 5-6.4 409 102. 4. 27 l. 25 2. 0-8. 9 226 226 4. 75 1. 30 2. 5-9.9 39 20 3.76 0.74 2.5-6.4 57 19 4. 63 0. 53 3. 0-5.9 21

2 40 153 0 0 7 2 0 0

5 3.94 0.84 2.5-5.9 4. 75 0. 00 4. 5-4. 9 20 4. 35 0. 80 2. 5-6.4 38 4. 94 0. 84 2. 5-7.4

2 5.11 0.75 4.0-6.4 2. 50 0. 35 2. 0-2. 9

:J~ 3.60 0.81 1.5-4.9 9

l! r 3. 56 0. 65 2. 5-4. 9 858

Whiting

N N;hr

L

Sd Range

3.25 - 3.0-3.4

43 11 2.39 0. 63 l.0-5.4 32 32 3. 39

o.

57 2. 0-4. 9 217 72 2.86 0. 73 1.5-4.9 8 2 4. 38 0. 95 3. 0-5. 4 44 44 3. 69 0. 36 2. 0-5. 9 56 28 3. 43 0. 84 l. S-5. 4

0 0 0 3 0 0 0 16 0 0 0

2 3. 75 l. 32 2. 5-5.4

4 2.91 0.30 2.0-3.4

Saithe

N N;h~

L

Sd Range

0 3 0 0 0 0 0 0

0

3. 42 0. 58 2. 5 -3. 9

3 1 3. 92 0. 58 3. 0-4. 9 0

0 0 0 0 0 0 0 2. 91 0. 30 2. 0- 3. 4 0

Norway Pout N

1923 21222

so

N/hr L Sd Range

1923 4. 22 0. 51 2. 0-5.4 5306 3. 50 0. 74 1. 5-5.4

50 2 . 6 6 0. 48 1. 5 -5. 9 1 7 4 58 2. 40 0. 4 9 1. 5-4. 4 63456 15864 4. 32 0. 53 2. 5-5. 9 1 1 3. 75 - 3. 5-3. 9 0

33 ll <1.20 1.10 2.0-5.4 94

896 3 5 3 0 0 0 0 0

0 2184

2.4 4. 36 0. 52. 3. 0-5.4 t.:24 4.2.2 0.5: 2.5-5.9 2. 3.75 0.8"' 3.0-4.9

4.95 0.27 4.5-5.4 2 4.

zs •).

'3-1 3. 5-4.9

332 4.28 0. 76 2.0-6.4 2114

4. 53 l. 33 2. 0-6.4 16 4. 03 l. 14 1. 5-9. 9 353 4. 27 1. 15 1. 5-8. 9 51

3. 11 0. 77 1. 5-5. 9 0

2. 70 1. 00 1. 0-5. 4,..._6 3.67 0.59 2.5-4.9 85676

4. 04 o. 75 l. 5-5. 9 4. 12 0. 69 1. 5-5.9

Table 3. C>1.-.:::h rates, mean length (cm). standard deviations 2.nd ranges of lengths by species and blocks of four statistical rectangles, 27 June - 3 July 1978.

Cod Haddock

E ·'JC.::~ Date S:1:ps

- - - - -N N/nr L Sd Ranae N N lhr L Sd Range 50--F• :-

48-47 46-45 42-41

~. £"::,

c-4-:J

? 4/i)

".S /6

.. , . .-_ 1. I

- 1/ 0

'7 42-41 F6-'7 7/7 42-41 FO-l 27,/6 40-39 FO-l 27/6

DANISH CO >:-: T ENGLISH C• •A5-T SCOT"<'ISE .:OAST NORWEGl.,;J. :::r:;EPS

E

.C.,

E F T

160 40 4.38 0 76 2.5-5.9 1122 280 4.23 1.31 l. 0-10.4 3.0-7.9 3. 0-6.9 2. 5-6. 9 36 9 4. 96 0. 80 3. 5-5. 9 98 24 5. 58 l. 29

117 ?.S 5.19 0.72 3.5-6.4 2 4 6 3. 0 6 1. 40 l. 0 - 5. 9 159 40 3.50 0.4.2 2.0-3.9

0

f)

183 2.'3 3.44 0.65 1.0-5.9 0

0

61 15 5.75 0.96 2.0 5 4. 85 l. 28 36

0 0

56

0 0

9 5 . 0 4 1. 48 3 . 0 -8 . 4

7 4.97 1.40 2.5-8.4

3L 26 4.?5 n.84 Z.5-6.4 1220 153 4.34 1.36 1.0-7.9

Whiting __ ---~9-i..~--- _ _Norway Pout

N N/hr

L

Sd Range N N;hr

L

Sd Range N N/hl;'

L

Sd R~

716 179 2.89 0.62 1.5-4.9 6 l 4.42 0.68 3.5-4.9 347 87 2.83 0.70 1.0-5.9 13 3 4. 52 0. 53 3. 5-5.4 2 <I 6. 25 1. 41 5. 0-6.9 303 76 4. 58 0. 70 3. 0-6.4 3 <1 4.75 - 4.5-4.9 0 5016 1254 4.56 0.60 3.0-5.9

742 185 3.89 0.96 1.0-5.9 0 0

597 149 4. 71 1.19 l. 0-7.9 0 0

0

0 0 1339 167 4. 25 1. 14 l. 0,-7. 9 0

0 0

0 0

0 0 0

0 0 0

732 61 2. 93 0. 66 l. 5-5.4 8 1 4. 87 1. 16 3. 5-6. 9 5666 472 4. 45 0. 74. 1. 0-6.4

Tabl8 ^t!-. r·e.c· 1-: ·~ates '"l)<.an length·-; (cm) s1.andard deviations and ranges of lengths by species and blocks of four statistical rectangles, 5-11 July 1978.

Black Date

48-4 7

:s ( -

7 t' (~' l 0 48 -4 7 E 4-5 S•

46-45 E8 -9 ll 46-45 £6-7 '7,3. 4o-45

s4 - s

c 44-43 E8-9 5. ll 44-43 E6-7 7 SCOTTISH COAST

Ships

-c:

:~

.E:~

E .S E E

Cod

N N/h··

L

Sd Range 11;- 4. 08 -L 45 3. 0--4. 9

r; 0 -L47 v.71 3.0-5.9 15 1~ 4.55 .. 39 3.0-5.4 18 5:? 89 l.04 2.~-7.4

r;

1~ 5 4. 50 0. 59 3. 5-5. 4 3 2. 4.42 0.29 -L0-4.9

Haddock

N N/hr

L

Sd Range

2031 508 5. 62 0. 92 3. 5-9.9 133 133 6.01 1.27 3.5-9.9 241 241 6. 33 0. 98 4. 0-8.9 209 52 4. 59 0. 66 3. 0-6.9 16 16 5.63 0.50 4.5-6.4 44 2 2 5. 2 4 0. 9 6 3. 0 -7. 9 23 12 4. 99 1. 02 3. 0-7.4 70 5 4. 26 0. 72 2. 5-5. 9 2697 180 5. 61 1. 00 3. 0-9. 9

Whiting Saithe

N N/hr L Sd Range N N;hr L 790 198 4.35 0.99 2.0-9.4 0

269 269 4. 61 0. 94 2. 0-8.9 0 49 49 3.63 0.73 2.0-5.9 0 1 3 6 3 4 4. 53 l. 0 4 2 . 0 -10. 4 0 70 70 5.01 0.91 2.0-7.9 0 16 8 4. 16 0. 71 2. 5-5.9 0 28 14 4. 59 1. 08 2. 5-7. 4 0 1358 91 4. 43 l. 00 2. 0-10.4 0

Sd Range

---

^{~ ~--~---·}

Ne--wav Pot>.t

N N/hr L Sd Range

8 ^? ~ 1..^-,. . ^'> t_,l' ^r 0.1? 2.0-2.9

2280 2280 5.56 0.8'.l 1.5-7.4 121 l2.l 4. 2b l. 41 2. 0-7.9

0 0 2

~1 2.75 - 2.5-2.9

3.25 3.0-3.4 _ 2 412 161 5. 48 0 • 8 9 l. 5 -7. 9

Tabl e 5. Geometric means and 95 % c o nfidenc e l imits f or all s pecies for t he first a nd second t imes o f samp l ing and for the whole sur vey.

Danish Coast

Mean 95%

1 st

time No.of obs ..

^=::

8

Cod 98 . 4 28 . 7-23 7 . 5 Ha ddock 15 .3 3 .. 6-65.9 Whit ing 0 . 6 0.4-1. 1 No rway pout 0 .. 0

Saithe 0 .0

2 nd

t i me No.of obs.= 8

Cod 21.9 6 . 2-77 .. 2 Haddock 7.3 2.5 -2 1.0 Wh iting 549 . 9 68.2-44 35.6 . Norway pout 0 . 0

Saithe 0. 0

Whole s urvey Nooof obs.,= 16

Cod 62.4 26.1- 149., 4 Had dock 10 . 6 4.8-23 . 3 vvhi ting 112.7 29.4-4 31 .,5 No r way pout 0 . 0

Sait.he 0 , 0

British East Coast

M e an 95%

No.of obs .= 18

0 . 7 0.5 - 0.9 0.1 0.09 - 0.11 0.1 0.09 - 0.11 0.0

0 . 0

No.of obs.= 17

2.2 1.3-3.9 0.43 0 . 33-0.56 0.53 0.37 -0.75 0 . 0

0.0

No.of obs.= 35

2.1 1 ., 4-3.2 0 .25 0.22-0.2 9 0. 2 9 0 . 24-0.35 0.0

0. 0

Northern area

Mean 95%

No . of o bs .= 57

3 . 6 2 .. 6 -4. 8 39.0 24 . 0 - 63.3

3.5 2.5-4 . 9 2620 1089-6303

1.3 1.0-1.6

No.of obs .= 59

9 . 1 168 . 0 23.2 191.1 0 . 2

6.3 -13.1 98.6-286.5 14.0-38.3 810 -45 05

No.of obs.= 116

6 . 0 4 . 7 -7e 7 8 5.,3 59 . 0-123.

10. 2 7.,5-13 . 9

2239 1215-4125

0 . 7 0 . 6 -0.8

Table 6. Geometric means and 95% confidence l imits for cod, haddock and whiting by standard areas (see t ext) for first and second tim e of sampling and for whole surveyo n = number of observations.

Cod Haddock Whiting

1st time of sampling

n

20 19 38

Me a n

41.5 53.1 0.8

95%

16.9 -1 02.1 2le6-130.7

0.6-1.0

2nd time of sampling

n Mean

2 0 40.6 20 495.4 39 53.7

95%

20.0-82.1 178.3-1376.6

27.5 -1 04.8

Whole survey

n

40 39 77

Mean 95%

43.3 24.9-75.5 230.9 114.5-465.5

12.8 8.6-19.1

Table 7. Geometric means and 95% confidence limits for haddock and Norway pout for the northern area for 1974-1977. n =number of observations.

Year

1974 1975 1976 1977

n

55 50 104 97

Haddock

Mean 95%

828.0 423.4-1619.1 65 s 4 35.0 -1 22.2 154o5 98.6-241 . 9 33.4 23.4-47.9

Norway pout

Mean 95%

2599 1112-6073

1269 542-296 9 19845 9724-40498

209 124-352

T1ble 8. Indices of year-class a bundance f o r cod, h addock and whiting from the 0-group surveys (a = standard area, b

=

northern North Sea area) and from the IYHS a nd virtu al population a nalysis and for Norway pout from the 0-group survey only : figures in pare nthes es are based

o~ non-sta~dard

survey resu l ts.

iea. r Cod Haddock Whiting Norway pout

0-gp IYHS VPA 0-gp IYHS

VPA

0-gp IYHS

VPA

0- gp

"a) ^(a)

^(b)

1969 - 60 3 67 248 - ^{35 109} 7 1 777

1970 - 89 450 34 - ^{1545 899} 22 5 849

97 1 - ³ 82 406 8 - ⁹⁵⁷ 1325 356 1 7 8

197 2 ( 2 6) 32 1 58 93 - 230 259 (138) 1161 2 3 3 7

1973 (8) 11 138 301 - ^{1314 1298 ( 4 0) 325} 1631

1974 157 55 2 28 2173 828 1370 2541 276 943 2392 2599

1975 17 6 121 622 65 212 552 70 832 965 1269

197 6 188 44 579 155 189 16 436 19 8 45

1977 35 12 14 3 32 458 4 474 209

1

978 43 23 1 85 13 223 9

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11· 0

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