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Acoustic abundance estimation of demersal fish in the coastal area of Møre in March 1980

By Olav Rune Godø and Reidar Toresen

Abstract

At the Møre coast there are important spawning areas for cod, coalfish, haddock and herring. As a part of an interaction study of these species, i.e. the predation of the demersal species on the spawning stock and the eggs of herring, an acoustic survey for estimation of the abundance of the demersal stocks was carried out in the last week of March. During the survey hydrographic data were sampled by a CTD-sonde. Acoustic abundance of demersal fish was devided between cod and haddock as one category and coalfish as another. As biological sampling by trawling occasionally was difficult because of high density of fishermens gillnets and rough bottom, biological data also were sampled from commercial catches in the surveyed area througout March. The behaviour of the fish was favourable for acoustic abundance estimation. However, some informations about haddock, observed as a heavy predator on eggs of herring, were supposed to be lost because it often stuck close to the bottom. The highest densities of cod were observed in the Breisund and at the Buagrunn, the last area also with the best acoustic recordings of coalfish and haddock. The stock abundance estimates of cod, haddock and coalfish were respectively 32 200, 11 560 and 51 760 tonnes. The experiences from this investigation indicate the acoustic method to be prosperous in abundance estimation of demersal fish in the surveyed area during the winter season

Publisher: Havforskningsinstituttet
Year: 1981
OAI identifier: oai:imr.brage.unit.no:11250/112671
Provided by: Brage IMR

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