dc.contributor.author | Jakobsen, Tore | |
dc.contributor.author | Nedreaas, Kjell Harald | |
dc.date.accessioned | 2012-07-03T09:28:02Z | |
dc.date.available | 2012-07-03T09:28:02Z | |
dc.date.issued | 1986 | |
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/11250/104173 | |
dc.description.abstract | In 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.iso | eng | no_NO |
dc.publisher | ICES | no_NO |
dc.relation.ispartofseries | ICES CM Documents;1986/G:69 | |
dc.subject | gadoids | no_NO |
dc.subject | torskefisker | no_NO |
dc.subject | stock assessment | no_NO |
dc.subject | bestandsberegning | no_NO |
dc.title | A model simulating the effect of sampling strategy on stock assessment of gadoids in sub-areas I and II | no_NO |
dc.type | Working paper | no_NO |
dc.subject.nsi | VDP::Agriculture and fishery disciplines: 900::Fisheries science: 920::Catch: 925 | no_NO |
dc.subject.nsi | VDP::Mathematics and natural science: 400::Geosciences: 450::Oceanography: 452 | no_NO |
dc.source.pagenumber | 24 s. | no_NO |