dc.contributor.author | Eikeseth, Helen | |
dc.contributor.author | Nakken, Odd | |
dc.date.accessioned | 2007-07-19T08:00:40Z | |
dc.date.issued | 1999 | |
dc.identifier.citation | This report is not to be quoted without prior consultation with the General Secretary. | |
dc.identifier.uri | http://hdl.handle.net/11250/100419 | |
dc.description.abstract | Maturation 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.extent | 1364076 bytes | |
dc.format.mimetype | application/pdf | |
dc.language.iso | eng | en |
dc.publisher | ICES | en |
dc.relation.ispartofseries | ICES CM documents | en |
dc.relation.ispartofseries | 1999/Y:19 | en |
dc.subject | haddock | en |
dc.subject | hyse | en |
dc.title | Maturation in North-East-Arctic Haddock. | en |
dc.type | Working paper | en |
dc.subject.nsi | VDP::Agriculture and fishery disciplines: 900::Fisheries science: 920::Resource biology: 921 | |
dc.source.pagenumber | 16 s. | en |