An evaluation of survey design for estimating the food consumption by fish
The effect of survey design on the precision of estimates of average fish stomach contents is examined. The contribution to the total variance from within and between tow variability in stomach contents is evaluated, and the implications for stomach sampling programs are discussed. As an example we...
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ftimr:oai:imr.brage.unit.no:11250/104888 2023-05-15T15:38:51+02:00 An evaluation of survey design for estimating the food consumption by fish Bogstad, Bjarte Pennington, Michael Vølstad, Jon Helge 1991 application/pdf http://hdl.handle.net/11250/104888 eng eng ICES ICES CM Documents;1991/D:15 This report is not to be cited without prior reference to the authors http://hdl.handle.net/11250/104888 17 s. stock assessment bestandsberegning survey design toktdesign stomach data magedata VDP::Agriculture and fishery disciplines: 900::Fisheries science: 920::Resource biology: 921 VDP::Mathematics and natural science: 400::Geosciences: 450::Oceanography: 452 Working paper 1991 ftimr 2021-09-23T20:14:34Z The effect of survey design on the precision of estimates of average fish stomach contents is examined. The contribution to the total variance from within and between tow variability in stomach contents is evaluated, and the implications for stomach sampling programs are discussed. As an example we have estimated the average amount of capelin in Barents Sea cod stomachs for years of very low, low and medium capelin abundance. The results indicate that to maximize precision for a given cost it is generally best to sample stomachs at as many locations as possible. A simulation study based on resampling from these data suggests that little is gained in precision by collecting 5 instead of 2 stomachs from each 5 cm length group of fish. Report Barents Sea Institute for Marine Research: Brage IMR Barents Sea |
institution |
Open Polar |
collection |
Institute for Marine Research: Brage IMR |
op_collection_id |
ftimr |
language |
English |
topic |
stock assessment bestandsberegning survey design toktdesign stomach data magedata VDP::Agriculture and fishery disciplines: 900::Fisheries science: 920::Resource biology: 921 VDP::Mathematics and natural science: 400::Geosciences: 450::Oceanography: 452 |
spellingShingle |
stock assessment bestandsberegning survey design toktdesign stomach data magedata VDP::Agriculture and fishery disciplines: 900::Fisheries science: 920::Resource biology: 921 VDP::Mathematics and natural science: 400::Geosciences: 450::Oceanography: 452 Bogstad, Bjarte Pennington, Michael Vølstad, Jon Helge An evaluation of survey design for estimating the food consumption by fish |
topic_facet |
stock assessment bestandsberegning survey design toktdesign stomach data magedata VDP::Agriculture and fishery disciplines: 900::Fisheries science: 920::Resource biology: 921 VDP::Mathematics and natural science: 400::Geosciences: 450::Oceanography: 452 |
description |
The effect of survey design on the precision of estimates of average fish stomach contents is examined. The contribution to the total variance from within and between tow variability in stomach contents is evaluated, and the implications for stomach sampling programs are discussed. As an example we have estimated the average amount of capelin in Barents Sea cod stomachs for years of very low, low and medium capelin abundance. The results indicate that to maximize precision for a given cost it is generally best to sample stomachs at as many locations as possible. A simulation study based on resampling from these data suggests that little is gained in precision by collecting 5 instead of 2 stomachs from each 5 cm length group of fish. |
format |
Report |
author |
Bogstad, Bjarte Pennington, Michael Vølstad, Jon Helge |
author_facet |
Bogstad, Bjarte Pennington, Michael Vølstad, Jon Helge |
author_sort |
Bogstad, Bjarte |
title |
An evaluation of survey design for estimating the food consumption by fish |
title_short |
An evaluation of survey design for estimating the food consumption by fish |
title_full |
An evaluation of survey design for estimating the food consumption by fish |
title_fullStr |
An evaluation of survey design for estimating the food consumption by fish |
title_full_unstemmed |
An evaluation of survey design for estimating the food consumption by fish |
title_sort |
evaluation of survey design for estimating the food consumption by fish |
publisher |
ICES |
publishDate |
1991 |
url |
http://hdl.handle.net/11250/104888 |
geographic |
Barents Sea |
geographic_facet |
Barents Sea |
genre |
Barents Sea |
genre_facet |
Barents Sea |
op_source |
17 s. |
op_relation |
ICES CM Documents;1991/D:15 This report is not to be cited without prior reference to the authors http://hdl.handle.net/11250/104888 |
_version_ |
1766370237580574720 |