This paper not to be cited without prior reference to the author

l)~1

International Council for theExploration cf the Sen

C.r1.1969/F:7

Domersal Fish (Northern) Coomittee

".

•

.§.E.[\wnipg Cornmuni..lies of :ft,all!9-Q.od

t~t~ Extet::L~..J~F IUx5;a.1i

by

:U.P. :BirjukOvX)

Unlike herring and oprat which have a widc habitat with greatlyvariable hydrographi.cal characteristics in thc :Baltic Sea (inoluding brackishbights and bays), cod is found in thc pre-bottom layers of deeps wheresuch factors as tenpernture und sulinity are nore stable~. Nevertheloss,even there'considerable variations o~cur in environcental faotors, os weIlos in conditions fcr dcvolopnent of eggs, larvae and young specinen8. Thisio duc to the geo~raphical situation and the separation of thc differentbaoins. Thcse variations in the o~vironment may be expected to load toa certain phenotypic hetorogeneity and possibly to considerable discontintlityof individual opmming cor:ununities of the :BaItic cod. These queotiono, inspite of their grent thcoroticnl and practical significance, have not yet teer.fully studicd.

\Te will hore make an attempt to clear up the phenotypic differencenbetween cod opawning in different areas of sea, and the extent of mi::::ingor isolation, on thc bosio of norphonetric studies of data on cod tagsing~

Beoideo we also take into account the long-term studies on biology, opn~~ing

and abundance of oggo, larvae and young specimens on the principal s~awninb

groundo of the cod, vrhich are not referred·to here.,

The nD.-lierial for norphometric studies ,mo collected from thecatches of a reoearch vosool, nade simultaneously on all the principalspawning groundo (Arkona, Bornholm, Gdansk and Gotland Deeps) in the spnwningperiod (April). Sinultaneous collection of material in the spawning peakis an inportant condition for such otudieo, since the possible spawningconmunities are nore fully isolated at that time. 300 opecimens 'lerecollected und anolysed fron each spawning ground. Tho following indiceswere studied: lTeight, length, nunber of rays in ID, nunber of rays ln IID,depth; of IA, total nunbcr of vertebrae, vcrtebrae nunber ",ith inconpletehonol archs, [md the longth of s~TiI:lIJ.ing bladder appendices. 1'lith reßard tobiological chnracters, the follo"ing were taken into account: ace and lengthconposition, growth-rate, developcm~nt of gonads, areas, periode and intensityof spawning (anount of annually epo\nled eggs); for the period 1954-1968.The norphological investigotiono carried out by Kendler (1944), Ziocik (1938)and Fender (1961) were alGo taken into, account.

To otudy thc extent Of nixing the rcsults of cod tagging in 1962-1966were used. Loa l~Tdrostotic tags were uoed in oouth-eastcrn, enstcrn ondwestern :Baltic. Totally, 10,259 spoci~ons were tuggod, 503 Of then worereturned. Tho roculto obtained by 11ulicki (1950, 1955), Lavunov (1955) andOttorlind (1962) were oleo taken into conoideration.

Principal rosults of norphoDctric inve9tigntiono are ei~en inToble 1. The onnlyois of thie naterial suSgosts n consideroble ioolation Ofcod from the wentcrn 3altic (Ar~ona D~ep). In all invostigated charactoro,excluding the nvnber of rcys in IIDXX), stotistically valid differencos betwccncod fron thc western pn=t o~ the soo ond cod opalming in other nore oasternporto of the sec. 1Tore obtalnou.

x)

•

•

- 2 -

Cod fron the western part of the sea is characterised by lownoon voluo of total vertebrae nunbor and nunber of vertebrae with inconplotehenal orchn, os well an by low neon value of IA depth, nunber of rnys in IDnnd by shorter nppendices of swinning bladdor (Table 2). Cod proper to tlleBnItic Sea (to tho oast of Bornholn) has higher nean value of total vertobraenunbor~ nunber of vortebrne with inconp1ete hena1 archs, nunber of rnys inID and greater size of swi~ing b1adder appendices os woll os a greator dopthof IA (Tob10 3).

As to tho bio10gica1 characters by which cod fron tho eastern Bn1tic.diffors fron the western Ba1tic cod we nay nention greator size and neon weight,naro coop1icatod ago otructuro, oxtondod and noro variab10 spawning, grontordionotor of oggs, spawning in dooper aroas, and othor pocu1iarities. On tbebaois of our natorial 00 well as on tho basis of data by Fondor (1961) andKond1or (1944), all cod fron tho Baltic Soa are divided into two ioolatod stocksviz., cod fron tllO wootorn Baltic (to tho wost of Bornholn) ond tho Baltic Soaeod propor (to tho oast of Bornholn).

Tho Baltic Soa eod propor playa 0 loading part in tho fomotion oftl10 total stock (within tho wholo basin). Howovor, tho structuro of this stock,which ':0 conoider to bo a population, nust be heterogenoouo becauoo of aeonsidorablo geoGraphie and ocological isolation of individual spawning grounes(Bornholn, Gdansk and Gotland Deeps). Novorthe10ss, the analysis of norpho­notric.and biological data as well as the results of tagging, doos not allow ustopostulato tho conplote isolation of cod spawning in Dornholn, Gdansk andGotland Deops. \Thile statistioally valid differonoos are observod in all thochnractors botween tho spowning cod fron Gdansk and Got1and Deeps on ono hand,and that of tho ood fron the Arkona Deop on the othor, difforenoes betweenindividual spawning eonnunities within the populations aro found only ineertain ~harocters (Table 1, ond Appendix Tables 1-4). Wo beliove suchinconstdnt difference shown an inoonpleto, partial isolation; i.e. 0 certainpart of ono or another spawning eoonunity nay roproduco on difforent spawninggroundn in difforont yoars.

Tho dato of tagging also show a great nixing of tho Baltio Son oodpropor in tho poriodn of spnwning and feoding. For oxonplo, eod taggod on thospawning grounds of tho Gotland Doep havo nigratod into tho north-oastornBaltic (Ventspils area, norD thon 18%) and into the south-western Baltic (to thoStolpen and Bornholn Doops, npproxinatoly 40%). A eonsidorable part (34.2%)was roturnod fron tho sano aren (Figuro 1).

Cod tagged in tho aron of Klaipoda in tho fooding poriod nigrntodnainly to tho south-wost and wost. Of 183 spoeinono rocn.pturod, 58 woro eauchtin difforent parts of tho south-wostern and westorn Baltie (Gdansk Boy, Stolpe~Doop, Bornlloln Doop, south coast of Swodon otc.), and only 8 spocinons worocaught in tho north-aaotorn and contrnl Bnltic (aren of Ventopils nnd GotlandDoop). Tho ronnining 34 opocinons wero roturnod fron tho nhallows of Klaipod3,i.o. fron tho aron of tagging (Figure 2).

Moot of tho ood (approxinntoly 60%) taggod in tho Gdansk Bay wasrocnpturod within tho Boy. Tho ronaining 40% wore found both in tho wootornnnd northorn and north-oastern sea. In tho aroas of Stolpon and BornholnDoops as well ao off tho coasto of Poland and Swodon, 20 taggod opecinons(npproxinntoly 10%) woro caught; and in tho aroas of Vontopils, Klaipodaand Gotland Doop, 32 spocinens (approxioately 30%) wero found. Thus, codfron tho Gdanok Bay also nixes with cod fron othor areas to a groat extent(Figuro 3). . ;

A great pnrt of cod·m. 3%) tagged in oastorn Bornholn Doep in thofoeding poriod reonined on tho southorn ond western slopos of the sone doep.Howover, sone (19%) nigrated to the nouth-west into the area of Slupskoia Bank,and others (14.3%) nigratod to tho north-wost, into tho area of tho Swedinhsouth oonst. A fow (10.3%) noved to the south into tho areas of the GdanskBoy and Klaipeda Shallows (Figuro 4). .

Wo tagGod asnall nunbor on1y of cod dircctly on the spawning groundsof the Bornholo Doep, and thore were no returns fron this area. Judging f~oo

tho rosults obtainod by Polish (~mlieki, 1955) ond Swedish (Ottorlind, 1962)invostigatorn wo noy soy that individual speoinens of cod also nigrated intotho Gdnnsk Dny and Stolpen Deop, although DoSt of thon were rocapturod f~on

the sano nren. Tho dnta obtainod by Ottorlind (1962) indicnto a gront nixi~€ ofood fron tho northern part of tho o~a and fron the different porto of tho

~ ..L

- 3 -

Thus, Dass tagging of cod indicates an existence cf a certainisolation with 0 considerable degree of rnixing of different spawningcoonunities, i.e. not all cod inhabiting one or another area take partin the migrations, only a par:t ,af. the stock. , ,The share of migratory andsodentary cod is not the same for different areas (Table 4). Evidentlyit also changes from yoar to yenr. However, this problem requires anadditional investigation and will be considered by us in a special paper.

Sur::u:::J.ary. -1. A considerable isolation of the principal deape of the sea

whero spawning of cod and hotching of larvae and fry take plaee, as weIlas the heterogeneity of the hydrographical regine, suggest the e~=iotence

of geographie and ecological isolation of spa1'rning eod population.This, together with the effect of natural selection, provides a considerablephenotypic voriability.

•2. The most significant morphometric differences were found

between cod frorn the western (ta the west of Bornholm) and eastern (to theeast of Bornholn) Baltic. Therefore, we have divided all cod ~rom theBaItic Sea into two spawning populations: cod from the 110stern BaItic,and the Baltic Sea cod proper. Such an isolation of cod is confirmcd byanalysis of a numbor of other biological indices (age and lellath compositio:,t,periods of spa'fning, diameter of eggs, etc.) ond by the dato from tagging.

3. The population of the Baltic Sea cod proper is not honogoneouf2and consisto of sDveral spawning communities; each of then spawns on acertain spawning ground (Bornholn, Gdansk and Gotland Deeps). Howevor,the extent of nixing, is considerable, although not equal. Cod from thoBornholn Deep are nore sedentary. Here the share of rnigratory cod was upto 20%, lThile in tho southern Gotland Deep and in the area of Klaipodait reached 65%, Qnd in the Stolpen Deep it was 85%. Cod frorn the GdanskBay take an intermediate place.

•4. The reasons for different isolation of cod stocks are not

clear. Most propably, cod in adefinite biological and physiologicnlstate are subjectcd to more considerable migrations and groater nixing.Thehydrograpllical regine, especially such n factor as the oxygen contentin tho prG-botton layors of the deeps, which varies considorably duringa season and fron year to year, mayaIso have a significnnt effect onsuch novenento.

References-

"1v9drowki Znnkowanych dorszy w po;J.undnim'1ynBa;tyku". Biul.Uorsk.Just.Rybacl::. vT Gdyni, .5.~

"Sone results of Baltic cod tagginr;".Tr.BaltNIRO, Ser.I.

llTorsken och dens Vandringovanor i Ostorsjönll •Sörtryck ur Sydkustfisknren, (2).

"Beitrago zuo Rassonproblem dos Ostseo-Ilo:.'8C;1;2\1,Fischereiforschung, H.6/7~

"11lfdrowki dorsza w po;undniov~'D Ba;tykull •Praco Morok.Just.Ryback. w Gdyni, ~.

"Bionetrioche }lerkn~lo dos Dorsches in der"="olniochen und Dnnißchcn Qotcee 11. ArchivrumHYdrobiol. i rybactwn, Suwnlwi, ~.

Lavunov, H.D. 1955

Fender, K. 1961

I-iulic!d, Z. 1950

Hulick5., Z. 1955

Otterlind, G. 1962

Ziecik, H. 1938

•

•

- 4 -

Table 1. Morphometric differences of cod (1:.) in thespawning period by principal deeps cf the sea.

I I I------1

I

I~kona, I Bornholo p Gdonsk p Gdansk, Gotland, Gotland,Characters BornholD GdaJ:lsk Gotland Arkona I Arkona I BornholD

Deeps Deeps Deeps Deeps Dceps I DeepsI

vleight /1.36 6.30 9.93 4.17 4.38 3.30

Length [2.41 0.40 9.25 3.22 5.40 2.87

No. of rays Iin I D 6.83 0.63 1.42 7.42 8~97 I 2.01

No. of raysin II D 0.09 0 0.59 0.09 0.70 0.59

Depth of I A 1.70 12.99 12.78 15.70 3.78 1.76

Total ver-tebrne Ho. 5.25 1.91 0.34 8.78 9.28 0

No. of vor-tobrno with 6.33 6.33 7.31 13.51 6.58 0.32inconpletcheoal archs

Lcngth ofswinoing bladder 5.55 4.05 5.67 1.54 6.94 1.22appondices

J .

Table 2. Mean values of norphooetric characters of codfron the western Baltic (Arkona Deep) •r Charaeters

,

ce'--11

,../{ ~n-uI IMean lro. of vertebrae 300 51.09 ±0.07 :I: 1.28

I Meon No. of vertebrae with Iincooplote hemal archs 300 18.08 :I: 0.04 ± 0;79

II

No. of rays in I D 300,

13.97 ± 0.04 ± 0.77 II

Length of swimming± 1.32 Ibladder appendices 300 3.04 ± 0.07 I

Depth of I .11. 300 2.95 :t 0.02 ± 0.47 II

(Total) 35.30 ± 0.27 :I: 4.70I

Length of fish 300 II

'veight of fish (Total) 300 484.0 ± 12.62 ± 218.60 II

- 5 -

Toble 3. Mean volues cf morphometrie eharaeters by whiehthe Baltie Sea eod proper differs fron eed cfthe western Baltie.

-r-

Iers Gdansk Deep Gotland Deep Bornholm DeepI

I IJll :: Yn I f:_J1 + h'1... 6 .)'1 ~ rn. <5verte-

1±1.0451.95 :!: 0.06 ± 1.10 51.98±0.06 ± '+• 51.13 0.09 -1.28

verte-• with 18.88 ± 0.03 ± 0.63 18.48±0.04 to.6e 18.50±0.04 ±O.82ete he- Ihs

rays14.44 ± 0.04 I ± 0.11 14.53±0.04 ±0.11 14.40±0.04 ±0.83

\

cfg blad- 3.20 ± 0.01 ± 1.21 3.19±O,,07 ±1.36 3.65±0.oe ±1.48endiees

f I A 3.55 ± 0.02 ± 0.45 3.09±0.02 ±0.44 3.02±0.03 ±0.53

cf fish36.39 ± 0,,20 ± 3.46 31. 38±0. 21 ±4.85 36.25±0.28 ±4.94

Iof fish

422.2 ± 1.42 ±121.62 ~58.93±11.14 ±198.63 1501.1 0 ±11.C17 ±191.11

I I .

Uo. ofin I D

Depth 0

Averagebroe Uoineooploal are

Length(Total)

1·Teight(Total)

• LengthswiI:lIIlinder opp

_'II

e8jnd.. ,

-IiIIiI1

II

I,_.1

Table 4. Share of migratory and sedentary eod by arens (%).

r---- i Bornholm Deep I Stolpen ~danskBehaviour

I' Southern/ Klai- Nörtnern l~tlierh

type cf (Otterlind, Deop Bny Gotland peda Gotland I Baltie Scod I 1962; JI'[uliek.4 Deep Deep (Otterli

I1955) 1962)

I-,l'iIigratory 0-20 85 40 65 65 40 21-50

Sedentary 80-100 15 60 35 35 60 17.0(largo)

I5000

I j(soall)

I! I i

•

,.".....

•

Weight, gr. ! Length, cm ! Number of rays in ID . ! Number of rays in IIDAge Sex !Avera-! I

.±.c1 tAve- ! ! cv !Avera-i ! .±.6! !Avera- ! ! !.±.m i cv .im !.±.6 .im ! cv I ge i ±m !.±. <5 cv

! ge I trage I i ge ! ! I! ! ! ! !

3 males 367.59 74,711 7.06 20.32 32.79 2.109 0.199 6.43 13.92 0.769 0.0727 5.52 17.34 1.351 0.128 7.79fe:;;ales .36ll- .50 73.660 824 20.21 32.66 2.179 C.244 6.E:7 13.84 0.781 0.0874 5.64 17.53 1.267 0.142 7.23

tot'3.l 366.20 7~37 5.29 20.CO 32.73 2.134 0.154 6.52 13.89 0.776 0.056 5.59 17.42 1.319 0.0952 7.57

males 660.36 196.023 26.43 29.68 39.02 3.858 0.520 9.89 14.15 0.762 0.103 5.39 17.47 1.452 0.196 8.31females 664.26 179.956 26.25 27.09 39.61 3.457 0.504 8.73 14.02 0.668 0.0974 4.76 17.21 1.253 0.183 7.28

total 662.16 187.481 18.56 28.51 39.29 3.727 0.369 9.49 14.10 0.714 0.0707 5.06 17.35 1.322 0.131 7.62

5 males 1264.00 292.027 130.60 23.10 49.40 4.277 1.91 8.66 14.80 0.837 0.374 5.66 17.40 1.245 0.557 7.16

Total males 487.27 232.521 17.73 47.72 85.26 4.766 0.353 13.52 14.02 0.781 0.0596 5.57 17.38 1.354- 0.103 7.79Total females 480.23 198.35 17.53 41.30 35.34 4.512 0.399 12.77 13.90 0.748 0.0661 5.38 17.41 1.267 0.112 7.28

Total feualesand males 484.27 218.602 12.62 45.14 35.30 4.706 0.272 13.33 13.97 0.770 0.0445 5.51 17.40 1.314 0.Cn59 7.55

Appendix. Table 1

ARKOHA DEEP. - Mean statistioal indices of some morphometrio charactersof ood from Arkana Deep (n .. ,00 speoimens.

C.M.1969/Fa7Biriukov

•

/

! ! Depth of IA ! Total vertebrae number !Vertebrae number with incomp- Length of swimming bladderAge ! Sex I ! Ilete hemal archs appendices

! I i I ! i! !,Ave- , avera-j ;!:,6 laver'l-l .

;!:,fO ·i +GIrage ;!:,m ! + G cv I . ;!:,m cv 100e .+ m cv fave- I + 1T1 cv! !- !ge ! !O !- ,rage i ,-males 2.74 0.355 0.0318 12.23 51.15 1.311 0.124 2.56 18.04 0.755 0.0713 4.19 2.65 0.920 0.0877 34.72

3 females 2.72 0.348 0.0389 12.79 50.90 1.375 0.154 2.70 18.00 0.851 0.0951 4.73 2.63 1.004 0.112 38.17

total 2.73 0.340 0.02.46 12.45 51.05 1.356 0.0984 2.66 18.02 0.801 0.0581 4.45 2.64 0.925 0.0671 35.04

males 3.32 0.466 0.0623 14.04 51.20 1.129 0.154- 2.21 18.17 0.832 0.113 4.59 3.40 1.206 0.163 35.474 femalec ;.32 0.:11 0.0454- 9.37 51.)2 1.283 0.187 2.50 18.26 0.C'55 0.0970 3.64 3.73 1.467 ::r.214 39.33

total 3.32 0.402 0.0398 12.11 51.26 1.195 :::.119 2.33 18.21 0.761 0.0758 4.18 3.55 1.315 0.130 37.04

5 :nales 3.69 0.304 0.136 8.24 51.40 1.140 0.510 2.22 18.00 0.707 0.316 3.93 6.60 0.886 0.396 13.42

Total lllales 2.95 0.471 0.0360 16.00 51.18 1.~53 0.0962 2.46 18.08 0.780 0.0646 4.31 3.01 1.225 0.0940 40.70

Total females 2.95 0.465 0.0411 15.76 50.97 ·1.348 0.162 2.64 18.08 0.822 0.0732 4.55 3.09 1.423 0.126 46.05

Total femalesand: males 2.95 0.472 0.0275 16.00 51.09 1.282 0.0740 2.51 , 18.08 0.694 0.0458 4.39 3.04 1.323 0.0766 43.52

AppendiK, Table 1 (ctd.)

C.M.1969/F: 7Biriukov

• • "

I f' weight, gr. i f .length, cm. Number cf rays in ID 'f Number cf rays in IIDAge ," Sex IAvera- 1 ! !Avera-l I JAvera- 1 ! ! IAvera.J. + 1

! • ! :!:.ill , + 6 cv , + m· !:!:.G cvIge I :!:.m ! + d ! cv '''"e ! _ m ! :!:. G cv

IIge ! I - ige f - 1 I ! ! 0 ! !

•3 males 370.44- 96.421 19.031 28.09 32.59 2.722 0.255 8.35 14.21 0.374 0.0818 6.14 17.40 1.1,54- 0.103 6.63

females 348.29 93.975 15.88 26.98 31.81 2.510 0.424 7.89 14.11 0.88 0.150 6.29 17.17 1.424 0.241 8.29

total 365.2} 96.472 7.90 26.41 32.41 2.862 0.234 8.83 14.19 0.877 0.0710 6.18 17.35 1.226 0.100 7.07

males 613.13 133.136 12.60 21.75 39.22 2.984 0.232 7.61 14.46 0.809 0.0764 5.59 17.20 1.259 0.119 7.324 f'emales 643.10 151.273 28.09 23.52 39.76 2.967 0.551 7.46 14.69 0.748 0.139 5.09 17.72 1.145 0.213 6.46

total 623.26 135.822 11.44- 21.79 39.33 2.983 0.252 7.60 14.51 0.795 0.0670 5.48 17.30 1.256 0.106 7.26

males 906.66 121.931 49.79 13.45 46.66 3.881 1.585 8.32 14.33 0.519 0.212 3.62 17.66 1.36.4 0.557 7.725 females1000.00 91.651 52.92 9.17 46.65 1.155 0.667 2.lj.8 15.00 1.000 0.577 6.67 17.33 1.528 0.882 8.82

total 937.78 116.51 38.84 12.42 46.67 3.121 1.040 6.69 14.78 0.834 0.278 5.64 17.56 1.335 0.445 7.60

Total males 507.68 18.3.337 1~.077 36.31 36.]4 4.245 0.317 1~.33 14.40 0.820 0.0537 5.69 17.3a 1.195 0.0782 6.88Total female;; 505.07 216.37 26.43 42.64- 35.92 ;5.22Z 0.638 14.51i- 14.40 0.884 0.108 (j .14 17.42 1.323 0.162 7.62Total femalesand males 507.10 191 .712 11.Gi j7.81 36.25 4.941 0.285 13.63 14.40 0.837 C.0433 5.81 17.39 1.224 0.0707 7.04

Appendix, Table 2.

DORNlIOtl1 DEEP. Mean stat1stical indices of some morphometr1ccharacters of cod from Bornholm Deep (n .. 300 specimens)

C~M.1969/FI1B1r1ukov

•,

I11verte~ae number with incomp-( Length of swiIllllling bladder

, ,Depth of IA Total vertebrae number! I I -

Age ! Sex jlvera-I. late ~mal archs - . appendices

!Ave- l .' t'A '

! ,IAveraf + I !

I 'rac-e l ±1J1 ± <5 cv Ige ! ±m I ±G cv i verat + m ! ±6 ! cv m I ±d , cv! ! O! . ! ! tge 1- ! ! ,ge !- I t

3 n:n.les 2.700 0.895 0.0370 14.52 51.35 1.459 0.137 2.84- 18.38 0.851 0.0797 4.63 2.98 1.184- 0.111 39.70

females 2.61 0.404 0.0683 15.43 51.40 1.283 0.217 2.50 18.46 0.803 0.136 4.40 2.95 1.158 0.196 39.25

tot::..l 6.69 0.403 0.0.330 14.98 51.56 1.290 0.106 2.;;1 18.40 0.~5 0.0692 4.59 2.97 1.178 0.0963 39.66

males 3.28 0.428 0.0404 13'.05 51.73 1.217 0.115 2.35 18.42 0.665 0.0628 3.61 4.35 1.404 0.133 32.28-4

females 3.30 0.344 0.0639 10.42 51.76 1.164 0.216 2.25 18.76 0.897 0.167 4.78 3.85 1.466 0.272 37.56

total 3.29 0.411 0.0346 12.49 51.74 1.187 0.100 2.29 18.49 0.750 0.0632 4.06 4.25 1.441 0.121 33.91

cales 3.77 0.557 0.227 14.77 51.83 1.662 0.654- 3.09 18.00 4.95 1.224 0.500 24.735 fe::J.ales 4.29 0.509 0.294 11.96 52.00 1.000 0.577 1.11 18.56 0.592 0.342 3.19 5.29 1.707 0.986 32.27

total 3.94 0.571 0.190 14.49 51.89 1.364 0.455 2.6) 18.22 0.443 0.148 2.43 5.06 1.298 0.433 25.65

Total males 3.03 0.521 0.0341 17.19 51.77 1.}41 0.0877 2.59 18.46 0.7~8 0.0477 3.94 3.71 1.422 0.0964 39.65

Total fe:nales 2.98 0.577 0.0705 19.36 51.,58 1.159 0.1l~2 2.25 18.60 0.849 0.104- 4.56 3.44- 1.438 0.176 41.80

Total femalesond :::ales 3.02 0.539 0.0311 17.85 51.73 1.282 0.0949 2.48 18.50 0.829 0.0478 4.48 3.65 1.482 0.0856 40.60

Appendix. Table 2 (ctd.)

C.M.1969/Fs7B1riukov

"

- ----------------------------------------------------------------~

\Veight, gr. 'I Length, cm Uumber of rays in ID ! ~umber of rays in ImAg€> Sex Ave- i+ eS /; IAve-

, ! I I! Ave- I I

Zm :!:m !+O Ave- , i (j; i ;!:m i +0rage ev irage cv rage . + m . + ? • cv , . - cv.- . ! - , - , - , jrage1 ! . . . !

oales 316.37 10.889 7.43 22.41 J3.59 2.236 0.234 6.66 14.37 0.828 0.0868 5.76 17.31 1.348 0.141 7.793 fe::ale s 369.42 79.694 11.05 21.57 34.68 2.446 0.339 7.05 14.46 0.821 0.114 5.68 17.50 1.237 0.172 7.67

total 335.66 78.638 6.58 23.43 33.99 2.391 0.200 '1.03 14.41 0.82.3 0.0688 5.71 17.38 1.278 0.107 7.35

males 477.20 97.206 11.22 20.:37 )8.24 2.369 0.274 6.20 14.53 0.721 0.0833 4.96 17.24 1.188 0.137 6.894 fel'lales 52<).'J7 99.3GJ 11.47 18.78 38.97 2.444- 0.282 0.27 14.39 0.745 0,0860 ;:;.18 17.65 1.237 0.143 7.01

total 503.13 102.053 8.33 20.2.8 38.61 2.483 0.203 6.43 14.46 0.735 0.0600 5.08 17.45 1.229 0.100 7.04

5 r::ales 800.00 84-.852 60.00 10.61 46.00 2.828 2.00 6.15 15.00 18.00fe:::ale s

total

Total males 392.78 124.791 9.60 31.77 35.78 3.479 0.268 9.72 14.46 0.777 0.0598 5.37 17.29 1.275 0.0981 7.37

Total females 463.70 120.616 10.72 26.01 37.22 3.281 0.291 8.81 14.42 0.777 0.0690 5.39 17.51 1.159 0.103 6.62Total femalesand males 423.21 127.675 7.42 30.17 36.39 3.469 0.202 9.53 14.44 0.779 0.Ol1-53 5.39 17.39 1.251 0.0727 7.19

Appendix Table 3. GDANSK DEEP. Mean statistical indices of some morphometric charactersfrom cod of the ~sk Deep- (n = 300 specimens)

C.M.1969/FI7:Biriukov

.."

'. '--

,.

.."

Age Se~ "

Depth of I A 'ITotal vertebrae number '1'yertebrae number with incomple~1 Length of swimming bladderI I te hemal archs . " a.pnendice s' . \

~'..,.--....---r----r---~t----.,---:--------+-. =-=-~=::-::=:'::::"_----.----t.-==::':':;'==--....----r-----jAve- !+ m ±. () cv jAvera-i + m l ±. <5 cv. jAvera-! + m ! + G ; cv jAvera;..l, + m i +<5 cvjrage !- ! ge ! - ! ! ge ! - ! - ! ! ge . - ! -

3

4

5

malesfemales

total

:Jales

feU'ales

total

males

3.07 0.309 0.0325 10.073.11 0.323 0.0448 10.39

3.08 0.312 0.O~02 10.13

3.44 0.829 0.0380 9.56

3.50 0.270 0.0311 7.71

3.47 0.279 O.02i8 8.04

52.04 1.037 0.10952 .04 0.898 0.124

52.04 0.988 0.0826

51.72 1.291 0.149

-51.99 0.993 0.115

51.35 1.159 0.0946

2.49

1.91

2.24

18.86 0.681 0,C7141ß.J] 0.616 0.0854

18.~2 0.676 0.056J

18.95 0.609 0.0703

18.91 0.593 0.0684

18.93 0.602 0.0492

19.00

3.21

3.13

3.18

2.G8 0.949 0.C9952.98 0.975 0.135

2.79 0.990' U.C803

3.42 1.122 0.130

3.71 1.240 0.143

3.57 1.248 0.102

5.57 0.123 0.0870

35.4132.72

)4'<41

32.81

33.42

34.96

2.21 T

Total males

Total fe:rrales

3.72 0.615 0.0474 16.53

3.34 0.351 0.0312 10.51

51.91 1.179 0.0907

52.01 0.995 0.0d48

18.91 0.669 0.0515

18.84 0.607 0.C539

3.04 1.190 0.0915

3.41 1.199 0.107

Total fe r.:a le sand males 3.55 0.457 O~02~6 12.87 51.95 1.103 0.0~~1 2.12 18.88 0.639 0.0371 3.38

Appendix, Table 3(otd.)

C.11.1969/F:1B1r1ukov

•

I, weight, gr. Length, cm Number of rays in I D Number of rays in Ir D

Age Sex iiverage Il: m I 1.'''''T'''.l.o.O'e!+ m 1+ 6 ' , 1 .±c5 !Average! ± Tn. !+ G• + () cv c..,.. j!lYerage j± m cv cv! ! l- I 0 !- l- I . . 1-

males 256.67 30.11 12.29 12.73 28.17 1.17 0.'+77 '+.15 1'+ .17 o.l~06 0.166 1.86 17.33 0.318 0.211 2.99<:: fell:3.le.s

total 258.57 27.945 10.56 1u.81 28;29 1.11j :; .4-21 3.93 14.1'+ 0.178 C.143 2.67 17.71 1.112 0.420 6.28

males 409.89 85.21 9.04- 20.79 33.65 2.4-2 0.257 7.19 14.48 0.941 0.0998 6.50 17.11 1.658 0.177 9.693 females '+36.14 104.33 1'+.06 23.92 34.38 2.69 0.355 7.82 14.60 0.724 0.0959 4.96 17.25 1.319 0.175 7.65

total 420.1'+ 93.163 7.71 22.17 33.J'J 2.59 0.21'+ 7.73 1'+.52 0.782'] 0.06'+7 5.39 17.16 1.540 0.:127 8.97

I:lales 627.53 1'+3.965 16.33 23.4-2 39.68 3.54- 0.398 8.92 1'+.47 0.722 0.0802 4.99 17.59 1.107 0.123 6.29'+ fO::'3.lI3S 707.'+2 135.67 16.69 19.18 40.6'-f. 2.4-5 0.301 6.03 14.62 0.796 0.0979 5.44- 17.33 0.951 0.117 5.4-9

total 663. /4-0 1'+8.198 12.22 22.}+ '+0.11 3.114 0.257 7.76 1'+.54- 0.760 0.0627 5.23 17.4-8 1.04- 0.0858 5.95

r::ales 830.00 100.28 35.4-6 11.39 46.'+3 1.992 o. 7Ql~ 4.29 1'+.63 0.744- 0.263 5.085 17.25 0.888 0.314 5.155 fe::.alc ::; 1003.00 113-'+32 35.87 11.31 46.35 2.109 0.667 4.50 14.80 1.032 0.327 6.97 17.30 0.323 0.260 4.76

total 948.30 122.84 28.96 12.95 46.67 2.121 0.500 4.54- 1'+.72 0.894 0.211 6.07 17.28 0.826 0.195 4.78

Total males 521.13 181.277 13.88 34.79 36.68 4.850 0.358 13.22 1'+.47 0.761 0.0561 5.26 17.3'+ 1.396 0.103 8.05Total females 610.82 210.786 18.21 34.51 38.35 4.682 O.'+~ 12.21 14.62 0.781 0.0675 5.34 17.31 1.157 0.100 6.68Total femalesund males 553.93 198.636 11.1'+ 35.54- 37.38 4.850 0.272 12.97 14.53 0.776 0.04-35 5.~ 17.33 1.296 0.0727 7.'+8

Appendix, Table 4. GOTLAND DEEP. Mea.n statistical indices of some morphcmetric characters of cod from Gotland Deep (n = 300 specimens)

C.M.1969/F:7Biriukov

.. .'

•.. ..

I Depth of I A "umber with incomplete l Length of swimming bladder appendices,Age Sex

,i ve-, !! rage! ;!: m ! ;!:z, cv I cv cv

2 males 2.40 0.343 0.141 14.38 51.50 1.609 0.657 3.12 0.315 4.24 1.98 0.718 2.93 36.26felMlestotal 2.47 0.374 0.141 15.14 51.71 1.495 0.565 2.89 18.29 0.754 0.285 4.12 1.93 0.663 0.251 34.35

t:!ales 2.92 0.305 0.033 10.44 51.87 .0.992 0.112 1.91 18.29 0.645 0.073 3.53 3.27 1.07 0.113 32.723 females 2.87 C.410 0.022 14.29 51.81 1.C91 0.148 2.106 13.33 0.817 0.111 4.45 3.44 1.094 0.145 31.80

totö.l 2.90 0.3:50 0.010 12.07 51".85 1.070 0.09)'1 .::..06 18.31 0.720 U.627 3.93 3.33 1.081 0.0895 32.46

males 3.23 0.393 0.044 12.17 52.00 1.049 0.124 2.017 18.56 0.622 0.074 3.35 3.97 1.424 0.158 -33.824

females 3.26 0.362 0.044 11.10 52.20 0.995 0.119 1.83 18.65 0.536 0.067 2.87 4.21 1.306 0.161 31.02

total 3,24 0.379 0.0313 11.70 52.10 1.01 0.0871 1.94 18.61 0.681 0.0586 3.66 4.08 1.372 0.113 33.62

I:1ales 3.60 0.315 0.111 8.75 52.25 0.71 0.251 1.36 19.13 0.639 0.226 3.34- 4.70 1.258 0.443 26.665

fcmales 3.59 0.646 0.204- 0.876 0.267 4.53 1.431 0.453 26.7517.99 52.10 0.277 1,68 18.60 0.843 5.35

total 3.59 0.512 0.121 14.26 52.16 0.787 0.186 1.51 18.83 0.786 0.185 4.18 5.0G 1,357 0.320 26.81

Total males 3.07 0.410 0.0302 13.36 51.93 1.063 0.0833 1.99 18.45 0.664 0.0520 3.60 3.60 1.338 0.106 37.17Total females 3.11 0.466 0.0403 14.98 52.04 1.015 0.0894 1.95 18.52 0.789 0.0695 4.26 4...06 0.360 0.117 33.50

Total femalesand mIes 3.09 0.440 0.0247 14.24 51.98 1.044 0.0611 2.01 18.48 0.689 0.0403 3.73 3~79 1.361 0.076) 35.91

_Appendix! Ta.ble 4 (otd.)

C.M.1969/F:113iriukov

C.H.1969/F:7/Biriukov

,I,· 16- 18° 20°00

" CD00

+0

56 ... V-65 n=I,ß{ 0

- ... o+/V-V-6!# fl2ßf556-

o 80

."V-6-'n=56/

•0 008.- 0 ao 0

t!)CYUlhtO 0 ++ +

0

0

51//.~~r--...L-_----::;;-------"'ici18;r---------:20~------15'f.°

J?iguro 1. Location of finding and recapture of cod te.,gged in the Gotland Deep 1963-1965.

- .'

C.M. 1969/F: 7/Biriukove.

+A

•• '-VIII-X-63n=560 ~

A+V'II-It-62n=20J,S

++11-6511.:1070A

•••

+A•

AA•

AA•

~--'-'-----~;r---------,::",-------_~~ ""5*0f~ 2tr

•AA

~o.ßozn!l.oem .j. 6

~ A 4 +IU: + + AA A • .4 .4 Avvl----~----r- ;_-~_;;;;__~=_~-~::::~ 1----..

A.. A. • 41~- l.A A A

A

Figure 2. Locations of finding and recapture of cod tagged in the ares. ofIG.aipeda in 1962-1963 and 1965.

....

C.M. 1969/F:7/Biriukov

••

+

o

o

°• 00 •

o

•o

O+II-V-tt=14'14 (35)...

I-\V-V-V/-68 1.-._ 0

• Qoon=fM6 t 7(~einin(Jzat1~+IV-'I-65 "lI

• n·l},

o

•oo

o ••• +~--~o.

•

• +

°

o

•

• .0

°5't "....~--~-----,,~tr:--------~{8~O--------2':":,o~o---_-I

Figure 3. Locations of finding and recapture of cod tagged in the Gdatisk Bay 1963-1965.

t5.Bo.znhoem •• /v-VIlI-X-65

."n=2d2

C.M. 1969/F:7/Biriukov

58

6+ {I,"

/60

•-.••••

/80

•

••

•

"'- ......

Figure 4. Locations of recapture of cod tagged in the Eastem Bornholm Deep in 1962-1963.