A combined acoustic and trawl survey for efficiently estimating fish abundance

Everson, Inigo; Bravington, Mark; Goss, Catherine. 1996 A combined acoustic and trawl survey for efficiently estimating fish abundance. Fisheries Research, 26 (1-2). 75-91. 10.1016/0165-7836(95)00404-1

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Abstract/Summary

When fish are patchily distributed, unstratified trawl surveys give highly variable abundance estimates. If the patches are small and mobile, it is impractical to use pre-stratified or multi-stage adaptive designs to reduce variability. Based on recent trawl surveys for mackerel icefish Champsocephalus gunnari, we have modified the survey design and analysis to reduce estimation variance at minimal cost, using concomitant qualitative acoustic data. We have also developed new confidence interval procedures that should be accurate even for small samples. In computer simulations, the new method substantially outperformed a standard trawl survey.

Item Type:	Publication - Article
Digital Object Identifier (DOI):	10.1016/0165-7836(95)00404-1
Programmes:	BAS Programmes > Pre 2000 programme
ISSN:	01657836
Additional Keywords:	survey design, acoustics, trawl survey, Champsocephalus gunnari
Date made live:	09 Nov 2016 11:24 +0 (UTC)
URI:	https://nora.nerc.ac.uk/id/eprint/515086

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