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f1o~~,'t1di'tc~to~ CBVC>{iot~'
This paper not to be .cited without prior reference to the author
International Council for
the Explorati~n of the Sea
C.M. 1968/ F: 33
Demersal Fish (Northern) Committee
Ref:
Pelagic Fish (Northern) Committee
Preliminary Report
of the O-group fish survey in the Barents Sea
and adjacent waters in August-September 1968.
1. Introduction
This survey was the fourth of a series of surveys in the Barents
Sea and adjacent waters to study the distribution and abundance of
O-group fish of the main commereial species: herring, capelin, cod,
haddock, redfish, saithe, long rough dab and ,polar cod.
The vessels taking part and the scientists in charge of each vessel
were as follows:
U.S.S.R. R/V "Akademik Knipovich ll Yu.K.Benko
R/V "Fritjof Nansen" A.S.Seliverstov
Norway R/V lIJohan Hjort" O.Dragesund, T.Monstad
R/V 11 G. O. Sars" L.r~dttun, P.Hognestad
England R/V "Ernest Holt" B.W.Jones
A preliminary planning meeting was held in Bergen on 27-28 J':.ue, then
all th~ vessels met in Murmansk on 23-24 August for a final discussion
of the programme in the light of the results of a preliminary survey that
had been made by "Akademik Knipovich" 6-15 August. The survey proper
commenced on 25 August and ended on 9 September.
2. Methods
As in previous years the distribution and density of the pelagic
scattering layer were estimated from the echo-sounder paper record, and
were identified by direct sampling by mid-water trawl. As in 1967 some of
the ships used integration techniques to obtain a more quantitative estimate
of the scattering layer. High frequency echo-sounders (100-120 kHz) were
also used to obtain better discrimination.
The area covered by the survey was much the same as in previous years.
The ships'tracks and the distribution of hydrographic and trawl stations
are shown in Fig. 1.
2
J. F.eS"L!l ts
3.1. '-".- - -~:./~ :irS"_~"'Ia 0_~;;/
TI~e ~"C:.l2. ~~::td.rozx"'[~~') __ ic data arc r.:.ot :r<3 -t Ek·.-.:.s.2."~~rsed, ~:)~lt t='~0 c":.:..al""ts
::'-.:.ave ~:;'Gel'l pl .... el')a1. .... sc~ .:.f t:.-.... G tGl-:lp6ra. tL7..re c:is t:. ... i-::·utions i:-::. c~e::-t~ls of
L:., 50,100 and 200 ;':':'8CG:CS {Figs. 2,3, L:. aLd :5;.
3.2. rE~e ctis tricl.: ti_?l'l _ s.:,-_G. a.Olli.~d.~=-~~C3 :.:):;: C-~~'7~:!2-£is.;.~
Fig. 6 shows t~e variation i~ total de~sit7 of t~a Gcattering
la~rer, -c·:r::;.icll. is COLlp085C~ of a ~.ral""i8t:T of ?la~£11:to11ic o:i-':za::-.i..iSLS as
1>'Jell as O-zrCl.llJ fis:~. ~.I:C:-,-0 derlsit:,:"' 1-.ras c~et.el""r..2il"led. ::;;:l eJ[a.::....~irlatio:.-::.
of tl~:.e p·aper ecl'lo-soc:-~d.el"" record c:.:'2cl :3ZpreSS3c_ i~1. te:r'l::-"s of a.
scala 0-4-. III SOI:le a:!"'Gas sea ttel"iiJ.g la-y0l .... s Gr 3£~oals of f:i.s~~ olcler
t~La:l O-gr"ou~p 'trlT6l--'e x"ecorCied. Res':.1.l ts :CT'OL1 t~"l'::; ilJ..tegl .... ati:~J.6 Gquipr.J.81'lt
2Te :'-.i.ot :,-et analyse(';..
T'r .... G gS11eral d.istris1.:tion of O-er'cup fis:'--L 1iIaS closel~! l""elateo_
to tl:..e ~'!a ter teltiPGl. .... [:..t'L:~-.G. 'l':::~-8 L'-.:ajori t-.:,: o~ species vlsl .... e clis tl .... ib:1-
tee. i=:.-: tj~le vJa1. .... ~1el .... T-J2.tel'" i:"-l tl'1.e c:.r1.t::.. .... cLl pa.r-t of t:'1.:9 ;Jare:'''1ts Sea
a::.c:' eJ~te~dilJ.g 1.21:/ alo:--1CS" tl-le ~'lest coast of 8pi tsoel-'gerl. }.--ola::;.-' cod
111as recordecl. i:-.:. t~'"2.e colcIcl."'" "\:-Jater i::~ tll.'8 easterrl PCi.:rt of -ti-.:.c sur-
vey area, but also west of 3p~ts~ergen.
3.2.1. ~:::erri:'"lg
O-gl .... Oi..lp .:.:~,~:::.:--l-.i:'l<;-. -::.J<~:..-.(~ C:..Gain vGr~T sca1.--'ce t~:~1.i8 yea=..-' cei:;:lg
al::::ost G:: .. :tirel~,r 2:",_.C3[1:t ovex" tl"le ·~'Tl-::.ole a:L"3c_. Tl'-1.e:/ ;:-J6:t..-'8 ::Y\T,SI::. less
a".J1.1'::':'C~.E;,.~-~t tl~2.:~~ 12_8-(; ·~7e8_r. "1'l-..~.is is t~._~·8 :-~01..1l""'t:·~ sllccessi--::[8 j:-eal' iIl
~T':-,-lC __ v-'3".i--'-~r 101-J E1.-.~·-._::'=--:''::2.:''-.:.C8 GJ: l:1.c:i.'""l .... iIJ_6 ~_..:.as t::a8=""l l-'ecoJ.."'"dc':. i:-J. t=-~G
j oi:"1.t 812rveys.
':(.'"_.2. -':;ccl
O-G':r'OU1:J eec:_ 1jl·91. .... G c_ic;tri0"l1teG_ U',.Te:;: a~.2. c_::'-'8~_ l:::_ .1_ ~ v_._c Gou~~er~ c0~t~al
part of" -tl'le ~~ar·e:'ltG ;Jea :-Ji t~:'" a sr:.all icclcL tGC_ lJc:.tc~'~. "lIeS t ~'~
;Jpi tsoeT"ge:'l ;" 'T' i '::."' Y/'" ,,1.. """0. ~ / • ~~e lengt~ con?ositic~ is 3~~'"01'T:" i::'-l £i""'i.s'". 1 J • C:.:-.tce agair: t~::c a~")"t:G'2c;.2..:n"ce of coc~ recol."'c.ec~ ::Jas lGvI 1:/:.:ic::.:.. D11..;~gest8
tl1.a t t~-':'e 156C ·:rea:»... .... -class v/ill be ai .... .:.ct::e:i."'" ~J3a:: 02'"ie. l .. o ::las t=-_D
case last jreclT tllel .... e 1,~aG 8.g-"aiil. a -V'irt1l.a~ a0Se:lCe c'f cod. 0::.:. t:1.G
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