Show simple item record

dc.contributor.authorJakobsen, Tore
dc.contributor.authorNedreaas, Kjell Harald
dc.date.accessioned2012-07-03T09:28:02Z
dc.date.available2012-07-03T09:28:02Z
dc.date.issued1986
dc.identifier.citationThis report is not to be cited without prior reference to the authorsno_NO
dc.identifier.urihttp://hdl.handle.net/11250/104173
dc.description.abstractIn the northeast Atlantic, management advice for fisheries is usually based on Virtual Population Analysis, yield per recruit, and predictions of catch and biomass. For these calculations, age distributions and weigth-at-age from commercial catches are essential. The process of sampling, age reading, and preparation of the data is time consuming and expensive. It is therefore important to find the optimum strategy for a sampling program. North-East Arctic cod, haddock and saithe are the three major demersal stocks in Norwegian waters north of 62°N. Sampling of Norwegian catches in coastal areas are based on 96 statistical units (gear, area, time) for each species. A model was made to simulate the stocks and exploitation in the period 1979-1983. The basis for the model was the observation that averaging the length frequency distribution of catches from a statistical unit over some years gave a smooth curve which could be approximated by a LOG-normal distribution. The results indicate that sampling may be omitted in most of the units without severe consequences for management advice. More length than age sampling is required.no_NO
dc.language.isoengno_NO
dc.publisherICESno_NO
dc.relation.ispartofseriesICES CM Documents;1986/G:69
dc.subjectgadoidsno_NO
dc.subjecttorskefiskerno_NO
dc.subjectstock assessmentno_NO
dc.subjectbestandsberegningno_NO
dc.titleA model simulating the effect of sampling strategy on stock assessment of gadoids in sub-areas I and IIno_NO
dc.typeWorking paperno_NO
dc.subject.nsiVDP::Agriculture and fishery disciplines: 900::Fisheries science: 920::Catch: 925no_NO
dc.subject.nsiVDP::Mathematics and natural science: 400::Geosciences: 450::Oceanography: 452no_NO
dc.source.pagenumber24 s.no_NO


Files in this item

Thumbnail

This item appears in the following Collection(s)

Show simple item record