A model simulating the effect of sampling strategy on stock assessment of gadoids in sub-areas I and II
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...
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ftimr:oai:imr.brage.unit.no:11250/104173 2023-05-15T14:30:28+02:00 A model simulating the effect of sampling strategy on stock assessment of gadoids in sub-areas I and II Jakobsen, Tore Nedreaas, Kjell Harald 1986 application/pdf http://hdl.handle.net/11250/104173 eng eng ICES ICES CM Documents;1986/G:69 This report is not to be cited without prior reference to the authors http://hdl.handle.net/11250/104173 24 s. gadoids torskefisker stock assessment bestandsberegning VDP::Agriculture and fishery disciplines: 900::Fisheries science: 920::Catch: 925 VDP::Mathematics and natural science: 400::Geosciences: 450::Oceanography: 452 Working paper 1986 ftimr 2021-09-23T20:14:13Z 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. Report Arctic cod Arctic Northeast Atlantic Institute for Marine Research: Brage IMR Arctic |
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collection |
Institute for Marine Research: Brage IMR |
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language |
English |
topic |
gadoids torskefisker stock assessment bestandsberegning VDP::Agriculture and fishery disciplines: 900::Fisheries science: 920::Catch: 925 VDP::Mathematics and natural science: 400::Geosciences: 450::Oceanography: 452 |
spellingShingle |
gadoids torskefisker stock assessment bestandsberegning VDP::Agriculture and fishery disciplines: 900::Fisheries science: 920::Catch: 925 VDP::Mathematics and natural science: 400::Geosciences: 450::Oceanography: 452 Jakobsen, Tore Nedreaas, Kjell Harald A model simulating the effect of sampling strategy on stock assessment of gadoids in sub-areas I and II |
topic_facet |
gadoids torskefisker stock assessment bestandsberegning VDP::Agriculture and fishery disciplines: 900::Fisheries science: 920::Catch: 925 VDP::Mathematics and natural science: 400::Geosciences: 450::Oceanography: 452 |
description |
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. |
format |
Report |
author |
Jakobsen, Tore Nedreaas, Kjell Harald |
author_facet |
Jakobsen, Tore Nedreaas, Kjell Harald |
author_sort |
Jakobsen, Tore |
title |
A model simulating the effect of sampling strategy on stock assessment of gadoids in sub-areas I and II |
title_short |
A model simulating the effect of sampling strategy on stock assessment of gadoids in sub-areas I and II |
title_full |
A model simulating the effect of sampling strategy on stock assessment of gadoids in sub-areas I and II |
title_fullStr |
A model simulating the effect of sampling strategy on stock assessment of gadoids in sub-areas I and II |
title_full_unstemmed |
A model simulating the effect of sampling strategy on stock assessment of gadoids in sub-areas I and II |
title_sort |
model simulating the effect of sampling strategy on stock assessment of gadoids in sub-areas i and ii |
publisher |
ICES |
publishDate |
1986 |
url |
http://hdl.handle.net/11250/104173 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic cod Arctic Northeast Atlantic |
genre_facet |
Arctic cod Arctic Northeast Atlantic |
op_source |
24 s. |
op_relation |
ICES CM Documents;1986/G:69 This report is not to be cited without prior reference to the authors http://hdl.handle.net/11250/104173 |
_version_ |
1766304309197144064 |