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dc.contributor.authorEikeseth, Helen
dc.contributor.authorNakken, Odd
dc.date.accessioned2007-07-19T08:00:40Z
dc.date.issued1999
dc.identifier.citationThis report is not to be quoted without prior consultation with the General Secretary.
dc.identifier.urihttp://hdl.handle.net/11250/100419
dc.description.abstractMaturation in north-east-arctic haddock was studied in relation to fish age; length, weight and condition factor using data from scientific surveys in 1989-1998. In order to investigate the reliability of the maturity determination undertaken routinely onboard, gonads from 165 female haddock sampled during the Barents Sea trawl survey in January-March 1998, were studied in binocular. The size of the oocytes were measured, fitted to a 6-point maturity scale, and compared with the 5-point maturity scale.used. The results showed that the maturity determination of the routine sampling was reliable. Additionally, maturity at length and age was investigated for males and females 'using data from the winter surveys in 1989-1998 by fitting logistic curves. variations in maturity were compared with growth and condition. Males mature at a smaller size and younger age than females. Considerable year to year variations were found in length at 50% maturity in both sexes. Fluctuations in length and age at maturity followed similar trends, suggesting that length, as well as age, determine maturation.en
dc.format.extent1364076 bytes
dc.format.mimetypeapplication/pdf
dc.language.isoengen
dc.publisherICESen
dc.relation.ispartofseriesICES CM documentsen
dc.relation.ispartofseries1999/Y:19en
dc.subjecthaddocken
dc.subjecthyseen
dc.titleMaturation in North-East-Arctic Haddock.en
dc.typeWorking paperen
dc.subject.nsiVDP::Agriculture and fishery disciplines: 900::Fisheries science: 920::Resource biology: 921
dc.source.pagenumber16 s.en


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