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Testing various geostatistical models to combine bottom trawl catches and acoustic data

Bouleau, Mireille; Bez, Nicholas; Reid, David; Godø, Olav Rune; Gerritsen, Hans D.
Working paper
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CM_2004_R_28.pdf (413.7Kb)
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http://hdl.handle.net/11250/106429
Utgivelsesdato
2004
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  • ICES CM documents authored by IMR scientists (1949-2011) [3139]
Originalversjon
This report is not to be cited without prior reference to the authors  
Sammendrag
The aim of the CATEFA project is to combine information on demersal fish stock

abundance from acoustic and bottom trawl surveys. While acoustic data are

collected continuously while the research ship is underway, it is likely that

combining two sources of information on the same variable should improve

abundance estimation. A variety of geostatistical models are compared, contrasted

and the output described. In this study, twenty scientific surveys from three areas

(the North Sea, the Irish Sea and the Barents Sea) are analysed. These 3 zones

have diverse species assemblages and hydrographic environments. Nevertheless

we manage to find models relevant to most of these different situations.

Unfortunately, however, we show that this enhancement can increase the variance

of the estimation because of the inherently high variability of acoustic recordings.

The purpose of this paper is to compare the results of three geostatistical models

(i.e. co-kriging, model with orthogonal residuals, kriging with external drift) in

terms of precision, details of maps, variance local and global of the estimation’s

errors and cross validation.

The role of the acoustic in each model and the precision it brings, is then

discussed.
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ICES
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ICES CM Documents;2004/R:28

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