dc.contributor.author | Slotte, Aril | |
dc.contributor.author | Johannessen, Arne | |
dc.date.accessioned | 2012-10-01T19:15:21Z | |
dc.date.available | 2012-10-01T19:15:21Z | |
dc.date.issued | 1997 | |
dc.identifier.citation | This report is not to be cited without prior reference to the authors | no_NO |
dc.identifier.uri | http://hdl.handle.net/11250/105697 | |
dc.description.abstract | The catch, distribution, and biology were studied in Norwegian spring spawning herring
during the spawning season in 1995. Both the spawning time and choice of spawning grounds
were influenced by the size and condition of the fish. The stock wintered in Vestfjorden,
northern Norway, and spawning grounds were utilized southwards along the coast within a
range of 1500 km. The herring arrived the spawning grounds in a decreasing order of length
and condition. This was mainly due to size specific swimming speed and not size specific
maturation. Delayed maturation with fish length was only found within the recruits, which
spawned in a second wave. In addition, the size and condition of the fish in a spawning area
increased southwards, and there was a delayed spawning and prolonged spawning period at
the northernmost spawning grounds. We suggest that life-history theory explains the observed
spawning distribution. Individuals must consider trade off between migration distance,
reproductive output, own survival and larval survival based on their body size and condition. | no_NO |
dc.language.iso | eng | no_NO |
dc.publisher | ICES | no_NO |
dc.relation.ispartofseries | ICES CM Documents;1997/CC:17 | |
dc.subject | herring | no_NO |
dc.subject | sild | no_NO |
dc.subject | population structure | no_NO |
dc.subject | populasjonsstruktur | no_NO |
dc.subject | spawning | no_NO |
dc.subject | gyting | no_NO |
dc.subject | migration patterns | no_NO |
dc.subject | vandringsmønster | no_NO |
dc.title | Spawning of Norwegian spring spawning herring (Clupea harengus L.) related to geographical location and population structure | no_NO |
dc.type | Working paper | no_NO |
dc.subject.nsi | VDP::Agriculture and fishery disciplines: 900::Fisheries science: 920::Resource biology: 921 | no_NO |
dc.subject.nsi | VDP::Mathematics and natural science: 400::Geosciences: 450::Oceanography: 452 | no_NO |
dc.subject.nsi | VDP::Agriculture and fishery disciplines: 900::Fisheries science: 920::Fish health: 923 | no_NO |
dc.source.pagenumber | 36 s. | no_NO |