Effects of trawl sampling variability on precision of acoustic abundance estimates of gadoids from the Barents Sea and the Gulf of Alaska
The quality of acoustic estimates of fish abundance is dependent on the quality of the biological information that provides the basis for determining target size, species composition and acoustic target strength distribution. Information on biological characteristics of acoustic targets is usually o...
| Published in: | ICES Journal of Marine Science |
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| Main Authors: | , , |
| Format: | Text |
| Language: | English |
| Published: |
Oxford University Press
1998
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| Subjects: | |
| Online Access: | http://icesjms.oxfordjournals.org/cgi/content/short/55/1/86 https://doi.org/10.1006/jmsc.1997.0255 |
| Summary: | The quality of acoustic estimates of fish abundance is dependent on the quality of the biological information that provides the basis for determining target size, species composition and acoustic target strength distribution. Information on biological characteristics of acoustic targets is usually obtained from trawl samples. In this paper we analyse the effects of trawl sampling variability on estimates of gadoid stock abundance in two areas where behavioural characeristics of the target species differ. The analyses demonstrate the sensitivity of abundance estimates to trawl sampling. Improved procedures for allocation of trawl sample information to acoustic survey results are discussed. |
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