Whole-gear efficiency of a benthic survey trawl for flatfish

Somerton, David A. and Munro, Peter T. and Weinberg, Kenneth L. (2007) Whole-gear efficiency of a benthic survey trawl for flatfish. Fishery Bulletin, 105(2), pp. 278-291.

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Whole-gear efficiency (the proportion of fish passing between the otter doors of a bottom trawl that are subsequently captured) was estimated from data collected during experiments to measure the herding efficiency of bridles and doors, the capture efficiency of the net, and the length of the bridles sufficiently close to the seafloor to elicit a herding response. The experiments were focused on four species of flatfish: arrowtooth flounder (Atheresthes stomias), flathead sole (Hippoglossoides elassodon), rex sole (Glyptocephalus zachirus), and Dover sole (Microstomus pacificus). Whole-gear efficiency varied with fish length and reached maximum values between 40% and 50% for arrowtooth flounder, flathead sole, and rex sole. For Dover sole, however, whole-gear efficiency declined from a maximum of 33% over the length range sampled. Such efficiency estimates can be used to determine catchability, which, in turn, can be used to improve the accuracy of stock assessment models when the time series of a survey is short.

Item Type: Article
Title: Whole-gear efficiency of a benthic survey trawl for flatfish
Personal Creator/Author:
Somerton, David A.
Munro, Peter T.
Weinberg, Kenneth L.
Refereed: Yes
Journal or Publication Title: Fishery Bulletin
Volume: 105
Number: 2
Page Range: pp. 278-291
Date: 2007
ISSN: 0090-0656
Issuing Agency: United States National Marine Fisheries Service
Subjects: Biology
Item ID: 8897
Depositing User: Patti M. Marraro
Date Deposited: 18 Jun 2012 09:32
Last Modified: 18 Jun 2012 09:32
URI: http://aquaticcommons.org/id/eprint/8897

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