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EVALUATION OF MIDWATER TRAWL SELECTIVITY AND ITS INFLUENCE ON ACOUSTIC-BASED FISH POPULATION SURVEYS

ResearchWorks at the University of Washington

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Title EVALUATION OF MIDWATER TRAWL SELECTIVITY AND ITS INFLUENCE ON ACOUSTIC-BASED FISH POPULATION SURVEYS
Creator Williams, Kresimir
Subject Abundance estimation; Fish Behavior; Fisheries Survey; Midwater Trawl; Pollock; Selectivity Fisheries and aquatic sciences Acoustics fisheries
Description Trawls are used extensively during fisheries abundance surveys to derive estimates of fish density and, in the case of acoustic-based surveys, to identify acoustically sampled fish populations. However, trawls are selective in what fish they retain, resulting in biased estimates of density, species, and size compositions. Selectivity of the midwater trawl used in acoustic-based surveys of walleye pollock (Theragra chalcogramma) was evaluated using multiple methods. The effects of trawl... Thesis (Ph.D.)--University of Washington, 2013
Contributor Horne, John K
Date 2013-07-23T18:29:26Z 2013-07-23T18:29:26Z 2013-07-23 2013
Type Thesis
Format application/pdf
Identifier Williams_washington_0250E_11439.pdf http://hdl.handle.net/1773/22816
Language en_US

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