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dc.contributor.authorEngås, Arill
dc.contributor.authorGodø, Olav Rune
dc.date.accessioned2012-07-05T06:12:23Z
dc.date.available2012-07-05T06:12:23Z
dc.date.issued1987
dc.identifier.citationThis report is not to be cited without prior reference to the authorsno_NO
dc.identifier.urihttp://hdl.handle.net/11250/104260
dc.description.abstractThe Institute of Marine Research, Bergen, has carried out combined bottom trawl and acoustic surveys for cod and haddock in the Barents Sea - Svalbard area since 1981. These investigations have demonstrated clearly that the currently applied survey methods considerably underestimate the young age groups of cod. For haddock the survey abundance estimates have been considerably higher than those used in the stock assessment. Part of the problem has been shown to be be low bottom trawl efficiency for small fish. It has also been indicated that the pelagic trawl has low efficiency for cod. In this paper variation in length and species composition from samples taken with a bottom trawl and with a pelagic trawl on and off bottom are analyzed. Differences in sampling efficiency and the problems connected with combining data from different trawls during routine surveys are discussed.no_NO
dc.language.isoengno_NO
dc.publisherICESno_NO
dc.relation.ispartofseriesICES CM Documents;1987/B:15
dc.subjectbottom trawlno_NO
dc.subjectbunntrålno_NO
dc.subjectpelagic trawlno_NO
dc.subjectpelagisk trålno_NO
dc.subjectsamplingno_NO
dc.subjectprøvetakingno_NO
dc.titleNear-bottom sampling with bottom and pelagic trawlsno_NO
dc.typeWorking paperno_NO
dc.subject.nsiVDP::Mathematics and natural science: 400::Zoology and botany: 480::Ethology: 485no_NO
dc.subject.nsiVDP::Agriculture and fishery disciplines: 900::Fisheries science: 920::Catch: 925no_NO
dc.source.pagenumber10 s.no_NO


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