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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Bibliographic Details
Main Authors: Bogstad, Bjarte, Pennington, Michael, Vølstad, Jon Helge
Format: Report
Language:English
Published: ICES 1991
Subjects:
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
Barents Sea
Online Access:http://hdl.handle.net/11250/104888
Description
Summary: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.

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