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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.

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