International council forthe Exploration of the Sea

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ACOUSTICAL SURVEY IN SKAGERAK-KATTEGAT ANDTHE WESTERN BALTIC IN AUGUST-SEPTEMBER 1985

By

CM 1986 H:66Ref Fish Capture

Baltic Fishctee's

P.Degnbol 1),. O. Hagström 2), L.E. Palmen 2)and K. J. Stcehr 1)

1) Danish Institute of Fishery and Marine ResearchP.O.Box 101. DK 9850 Hirtshals, Denmark.

2) Institut of Marine researchS 453 00 Lysekil, Sweden.

Abstract

Results of an acoustic survey in div. 3a, 22, 23 and24 in August - September are presented. Data are pre-sen ted on stock size in numbers and weight and meanweight per individual by age and stratum for Herring.Length freqvencies of 1-group Herring have been splitinto components.

funk-haasNeuer Stempel

Tn t r 0 Ctl C t : 0 n

A j 0 .; n t f' an; s h - C; w e Cl i s h a (' Cl 1\ S t "c s u r ve y \..r Cl s c a r r ; P cl f) 11 t f r I' I!': ' I·aug. to 6 sep. 9RS. Tntep,ration ann tra\l!';ng \.Jas clone hy bothof the participating vesse S, na na ann Argos. ~esu'ts fnrHerr:ng are presented in the prescnt report.

2 Methods

7. l.:ntegrat;on

f. c h 0 : n t e p; rat .; 0 n \,/ ase a r r i e cl n 11 t \., i t h a 3 Po k H z S i mr a cl 1\ Y ,: () 0e eh 0 so" n cl ern n 1\ r p; n s Cl n Ci \.J: t h a J 8 k H 7. S i mra ci r. K I, () 0 t h r n 1I Po h aS'mrad ES l,on echosonncler. The integrator ~las a 00 on nana nne1 aJ 0 R -' 0 r .; t ted \. ; t h t h e n 0 n.,r e p, i a n e (' h ()'; nt e g rat i () n S 0 f t toT are 0 nArgos. Settings ann ca'ibrat1on pArameters were as fo'lnws

R /\' Ar gn s R/p !lana

SOl nder EY.I.OO IRkllz F,l(40n ll

ACOUSTTC STJR\'EY ITTA 2"-2",-;'4

ACOUSTIr: STJRVEV lIlA 22-23-;)[, aug-sept 1985

Mackerel wad assigned a TS 6 dB below that of Herring.

2.6 SpJft Of J-group In Length Components.

Page 4

l-group Herring ]ength frequencies were sp]itmethod of Macdonald and Pitcher (1979).

3 Resu]ts

3.1 Herring Stock Size And r:omposition

according to the

The number, hiomass and individual mean weight of Herring bystratum and age fOHnd during the survey is sho,,,n in tables 'l-l,.

Length distributions of l-group Herring by stratum are shown iffg 4. A split in length distribution cornponents inc 1 udinginformation on vertebral counts is provided in table 5.

3.2 Split Of l-group Herring lnto Stock Components. •4 References

Macdonald, P.D.M. and T.J.Pitcher 1979 Age-groups fromsize-frequency data a versatile and efficient rnethod ofanaJyzing distribution mixtures. J.Fish Res. Board Can. 36987-1001.

Tab1e 1 Survey statist.ics

25-MAR-86 09:48:45 2

Ca1cu1ation of stock size for acoustic surveyI I IA + 22, 23 , 24 1985

SURVEY STATISTICS

STRATNO AREA NO. NM. NO. HAULS NO. CTD N/SQRT(A) AV.SA VAR.SANM*."" 2

Al 339 103 1 0 5.59 o.-204E-05 0.135E-10A2 191 29 1 0 2.10 0.340E-05 0.784E-11A3 212 71 1 0 4.88 0.342E-05 0.503E-10A4 523 119 2 0 5.20 0.236E-05 0.759E-11A5 655 121 1 0 4.73 0.405E-05 0.153E-09BO 539 0 1 0 0.00 O.OOOE+OO O.OOOE+OOBI 324 163 1 0 9.06 0.338E-05 0.934E-I0B2 156 57 1 0 4.56 O.123E-04 0.301E-09B3 278 99 2 0 5.94 O.102E-04 O.520E-09B4 490 138 2 0 6.23 O.359E-05 0.227E-10E5 1124 131 1 0 3.91 O.125E-05 O.671E-11C3 200 15 1 0 1. 06 0.882E-06 O.584E-13C4 476 137 2 0 6.28 O.415E-06 0.195E-12CS 127 32 1 0 2.84 O.213E-06 O.303E-13D1 71 12 1 0 1.42 0.541E-06 O.387E-12D2 169 60 1 0 4.62 0.689E-05 O.152E-09D3 433 195 3 0 9.37 O.907E-05 O.311E-09D4 733 334 7 0 12.34 0.563E-05 O.498E-09D5 295 41 2 0 2.39 0.842E-06 0.497E-l1EO 3493 69 3 0 1.17 0.168E-06 O.348E-12EI 1216 767 7 0 22.00 0.736E-05 0.291E-09E2 382 114 3 0 5.83 0.116E-04 0.851E-09E3 137 43 1 0 3.67 0.854E-05 O.120E-09FO 4255 29 1 0 0.44 O.566E-05 0.385E-10FI 1469 392 3 0 10.23 O.963E-05 O.915E-I0GI 99 25 2 0 2.51 O.748E-06 0.245E-11HO 3008 92 2 0 1.68 O.237E-05 0.119E-10Hl 2000 345 6 0 7.71 O.415E-05 0.380E-I0H2 1441 323 6 0 8.51 0.581E-05 O.540E-10

Table 2 Herring, numbers by startum and age

25-MAR-86 09:48:46 3

Calcu1ation of stock size for acoustic surveylIlA 1- 22,23.24 1985

NUMBERS. MlO S

STRAT NO. AGE W.R.

D 1 2 3 4 5 6 7 8 9 10+ TOT.

Al 477 1 0 0 0 0 0 0 0 0 0 478A2 138 4 0 0 0 0 0 0 0 0 0 142A3 331 5 0 0 0 0 0 0 0 0 0 336A4 420 31 11 2 0 0 0 0 0 0 0 464A5 0 0 0 0 0 0 0 0 0 0 0 0BOBI 589 24 0 0 0 0 0 0 0 0 0 612B2 235 0 0 0 0 0 0 0 0 0 0 235B3 1381 0 0 0 0 0 0 0 0 0 0 1381B4 18 8 2 0 0 0 0 0 0 0 0 29.B5 0 38 45 3 0 0 0 0 0 0 0 86C3 35 1 0 0 0 0 0 0 0 0 0 36C4 15 3 6 4 1 0 0 0 0 0 0 29C5 0 "j 1 0 0 0 0 0 0 0 0 4...D1 0 5 1 1 0 0 0 0 0 0 0 7D2 0 13 13 "j 0 0 0 0 0 0 0 28...D3 .1673 71 53 5 1 0 0 0 0 0 0 1803D4 84 24 31 21 4 1 0 0 0 0 0 164D5 (I 3 2 1 0 0 0 0 0 0 0 7EO 0 0 0 0 0 0 0 0 0 0 0 0EI 282 596 641 24 ..., 1 0 0 0 0 0 1546...E2 266 273 325 9 3 0 0 0 0 0 0 876E3 612 17 7 1 0 0 0 0 0 0 0 636FO 348 2192 309 0 0 0 0 0 0 0 0 2849Fl 89 1725 474 70 0 0 0 0 0 0 0 2358GI 0 4 5 2 0 0 0 0 0 0 0 11HO 112 20 23 10 2 1 0 0 0 0 0 169H1 115 122 99 43 11 6 1 0 0 0 0 397H2 185 313 165 65 45 14 3 2 2 3 0 797

TOTAL 7405 5493 2214 263 70 23 5 2 2 3 1 15480e e

~ ----------------------------------------------------------------,1

eTable 3 Herring. biomas by stratum and age

25-MAR-86 09:48:47 4

Calculation of stock size for acoustic surveylIlA + 22.23,24 1985

SSB. TaNNES S

STF.AT NO. AGE W.R.

0 1 2 3 4 5 6 7 8 9 10+ TOT.

Al 3306 30 0 0 0 0 0 0 0 0 0 3336A2 1472 178 0 0 0 0 0 0 0 0 0 1649A3 3604 279 0 0 0 0 0 0 0 0 0 3883A4 4675 2390 1401 245 0 0 0 0 0 0 0 8711A5 0 0 0 0 0 0 0 0 0 0 0 0BOBI 6349 750 0 0 0 0 0 0 0 0 0 7100B2 2541 0 0 0 0 0 0 0 0 0 0 2541B3 13989 0 0 0 0 0 0 0 0 0 0 13989B4 206 568 235 0 0 0 0 0 0 0 0 1008B5 0 3740 6879 556 0 0 0 0 0 0 0 11175C3 326 27 11 22 0 0 0 0 0 0 0 385C4 170 290 609 465 137 18 5 0 0 0 0 1693C5 0 161 109 47 17 4 0 0 0 0 0 339Dl 1 153 100 70 12 4 0 0 0 0 0 341D2 0 978 1062 186 0 0 0 C 0 0 0 2227D3 15647 4590 3526 447 0 0 0 0 0 0 0 24210D4 764 2085 3567 2638 581 98 37 0 0 0 0 9769D5 0 298 314 99 19 5 0 0 0 0 0 736EO 0 0 0 0 0 0 0 0 0 0 0 0EI 3331 34336 42650 2239 273 93 19 0 0 0 0 82941E2 2889 15379 20314 739 345 0 0 0 0 0 0 39667E3 5932 1026 614 79 0 0 0 0 0 0 0 7651FO 3407 70243 15263 0 0 0 0 0 0 0 0 88913Fl 1356 58207 24343 4889 0 0 0 0 0 0 0 88795GI 0 224 401 164 40 5 2 0 0 0 0 835HO 844 613 1262 1385 283 153 51 0 0 0 62 4654BI 1007 3590 5194 4213 864 764 205 43 6 0 31 15917HZ 1819 8838 8651 4526 3618 1419 366 217 170 336 52 30011

TOTAL 73636 208973 136505 23007 6189 2563 686 261 175 336 145 452476

Tab1e 4 Herring, mean weight by stratum and age

25-MAR-86 09:48:49 5

Ca1cu1atian of stock size far acoustic surveylIlA + 22,23,24 1985

WEIGHT/ IND. ,GR S

STRAT NO. AGE W.R.

0 1 2 3 4 5 6 7 8 9 10+ AVR.

Al 6.93 35.00 20.96A2 10.66 48.75 29.71A3 10.88 55.00 32.94A4 11.12 77.96 128.03 136.66 88.44A5 0.00BOBI 10.78 31.78 21. 28B2 10.81 10.81B3 10.13 10.13B4 11.30 67.43 111. 43 63.39B5 98.74 151. 96 195.33 148.68C3 9.22 52.57 144.00 146.00 87.95C4 11.40 88.32 107.15 119.54 182.78 151.26 197.00 122.49C5 15.00 86.24 91.53 121. 93 158.13 205.57 113.07D1 11. 09 33.86 78.25 104.68 138.84 168.29 89.17D2 75.00 81.43 100.00 85.48D3 9.35 64.38 66.95 85.50 56.54D4 9.12 86.28 113.82 127.52 157.24 195.23 197.00 126.60D5 15.00 86.24 132.02 134.71 158.13 205.57 121. 95EO 0.00EI 11. 83 57.60 66.51 92.95 118.50 138.00 177.00 94.63E2 10.86 56.38 62.49 82.74 124.50 67.39E3 9.70 60.21 88.39 141. 00 74.82FO 9.79 32.05 49.35 30.40Fl 15.25 33.74 51.41 69.51 42.48GI 61.57 77.16 105.30 151. 21 189.67 211.00 132.65HO 7.56 30.81 55.80 133.77 116.98 120.63 125.00 151.67 92.78Hl 8.78 29.51 52.48 97.18 80.32 124.93 144.86 154.00 214.00 151.67 108.34H2 9.83 28.22 52.53 69.44 79.75 99.28 137.49 122.89 99.89 110.22 117.50 87.85

AVERAGEUNW. : 10.71 57.40 88.13 114._ 133.31 159.84 169.91 138.4_ 156.94 110.22 140.28 75.42W. 9.94 38.04 61.67 87. 89.04 111.12 142.22 127.1 101. 60 110.22 141. 64 29.23

ACOUSTH: STTRn::V TTIA 2?-?1-24 nug-sept 1985

~ a b J e 5 S t 0 c k co rnp 0 s ~ t ion 0 f 1 - g r 0 IJ P Tl e r r i n gSpring spawners und a\lturnn sflm"ncrs have tentative1y been d;v;dedby a VS of 56.70.

Strata

n mean JpercentVS

•

•

A

ß

r.

E

rneanpercentVS

meanpercentVS

rneanpercentVS

mean 1percentVS

Sprinr. sp.

1 7 • ~ n n .058] 15

55.90 56.t1 O

16.40 20.5835 28

55.85 56.22

~9.30 n . JO5 67

56. 1 8 .5 6 • t l () -

17.00 21. 7024 76

55.90 56.40

20.2525

56.28

Alltul11n sp.

25.95I1

>56./10

23.2036

56.40

:'1. 60-1.2

56.40

20.7775

56.28

•

E

DEPTH STRATA:0: 0- 20 M1: 20- 40 M2: 40- 60 M3: 60-100 M4: 100-300 M5: 300 M

~"""------+-----f 56°

Fig 1 Depth strata used for survey evaluation

,----------- -- ----

Fig 2a Integration survey track, R/V Dana

lb

;

15"

/5

--·--·--i----

I~

11

1110q

8=--J---~~::::~r.:t~---_.- '..-----.-+----------1 58 0•

Fig 2b Integration survey track, R/V Argos

•

• •

x55°x •

)(X-•

Fig 3 positions for trawl hauls, X Dana, • Argos

Length cm

ITRATuw-e, AH_t

300 :

per

200 -

miII taO -

e

oL-,---- ~ -,--, -r -- r r , -, ----,-1.1. lt.7. 13.1. 15.75 17.1. 11.7. 21. 71 u:a 21.71 27.71 21.7.

Length cm11.7'lS.7!> '7.71

.001,pe

JOO ::r

mi 200::IIe 100:

Length cm

Length cm

p'

101e 110,r 140 ~

120 ..:

,A TIm '00 -i 10 ,I 10 -

~ V 'L--.I .0'e2:L__ , ,. - .-,-----,- - 1-- - -r----, -- ~r-----r----r

1.71 f 1. 711 fJ.71 11.71 17.71 te.7' 21.7' 13.71 21.711 27 .. 7' 21.71

Length cm

5r''-'TU''-.'' Aoe-,

JOO iper

200 -

miII 100 -,e

0 r--o

1.7. 11. 7. 1~.1. 11.15 17.7' 11.7' 21.7' a.\.TS 21.1. 27.1.ZI.7.

Length cm

--,2'.75

---r-27.7.

21.1121. 71--...---r---.....,---~~

211.7127.7121.71

---r - ----,-- -I".75 21.7. 23.7' %5.1511,76'.7.

1\I! Ii. \

i 'u ~o~.,- ,__ ,----1:5.7. 16.76 11.7a

110]P 100e 10r 10 ~

70 -

m 10.,i 10 - II 40 ~ NI 30 -e 20.':L I r--'

1.711 11.711 lJ.71 11.71 17.7. 11.71

e 100:

per JOO::

mi zoo::

II

Fi~.4a. Length frequencies of l-group herring by stratum.

Length cm2'.76

J,

j \-r--,-------,---,----r

".76 21.7. 23.7& 26.7' 27.761'.7616.761~.7611.70

.001

p 1,e aoo ~ir ;

'400 '3;

m ;

i JOD 5

I ;I 200 ;,e 1

100

1o~,'.76

Length cm

j-,,-"----'",·----r---r----r---r~17.7' 11.7. 21.7' 1.1.7j 2'.7' 27.76 2'.76

.- --.--13. 7& 1~.1S1'.76

ao01j

p :

e "00 :

r300 ~

miI 200 :

I ..:

e 100 :

01I

'.76

.nu TUW-e4 AR-'

Length cm

_..

'.70 11.76 '~.7a ".76 f7.76 ".7' 21.7' 2:L71 21.71 27.1. 2 •• 7.

P 200 j

fI_laoe

r 110,140

m 120

i 100 ""

I ::L--, --- ,--L,----\_-----,----

Ie .0

.0

o , __I

'.76 1'.7& 13.76 16.7' ',7.7. ".7. 21.76 2a.7. 2 •• 7. 27.76Length cm

2'.7.

'T~ATU.._g,ITItATUW-D4 AK-'

'.7a27, 7&

--r-- -. -r- -- - .--21.7' 2J.7. 26.7'

Length cm

I

17.7'

- r16.7',.7.

'00 ~

.L, --,-11.76 1.1.70

e

-'1·_--"27.1. 2'.11

. "' .-2:.76

Length cm

aoo -j

per

200 -

mi

I )I 100:

, .L-,--- , ,".76 1~.7a 16.76

Fig.4b. Length frequencies of l-group herring by stratum.

aTfilATUU-!1

21 .. 76

Io 'r----r--"--r--"--~---r_'~---'!:;i:!L.-"~'--..,---,--- - . r_,--~'.76 11.76 1.1.16 16.76 ".7. 11.71 21.71 23.7.1 25.76 27.76

200 -

P 300 J

er

miIIe

21.7527.7121.11 2:1.71 26.7111.7611.7116.7.11.76

100.,

oL.~---,---,~--r-~i-,----,-'.76

e

miII

: ..01r J

200 i

1~

Length cm Length cm

STftATUW-H2 AOE- 1

27.762a.7.21.7511.1111.7116.761.J.7611.76

,nlo"t,----.--l