Effects of commercial fishing on local abundance of Pacific cod (Gadus macrocephalus) in the Bering Sea

Conners, M. Elizabeth and Munro, Peter (2008) Effects of commercial fishing on local abundance of Pacific cod (Gadus macrocephalus) in the Bering Sea. Fishery Bulletin, 106(3), pp. 281-292.

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Official URL: http://fishbull.noaa.gov/1063/conners.pdf

Abstract

Groundfish fisheries in the southeast Bering Sea in Alaska have been constrained in recent years by management measures to protect the endangered Steller sea lion (Eumetopias jubatus). There is concern that the present commercial harvest may produce a localized depletion of groundfish that would affect the foraging success of Steller sea lions or other predators. A three-year field experiment was conducted to determine whether an intensive trawl fishery in the southeast Bering Sea created a localized depletion in the abundance of Pacific cod (Gadus macrocephalus). This experiment produced strongly negative results; no difference was found in the rate of seasonal change in Pacific cod abundance between stations within a regulatory no-trawl zone and stations in an immediately adjacent trawled area. Corollary studies showed that Pacific cod in the study area were highly mobile and indicated that the geographic scale of Pacific cod movement was larger than the spatial scale used as the basis for current no-trawl zones. The idea of localized depletion is strongly dependent on assumed spatial and temporal scales and contains an implicit assumption that there is a closed local population. The scale of movement of target organisms is critical in determining regional effects of fishery removals.

Item Type: Article
Title: Effects of commercial fishing on local abundance of Pacific cod (Gadus macrocephalus) in the Bering Sea
Personal Creator/Author:
CreatorsEmail
Conners, M. Elizabeth
Munro, Peter
Refereed: Yes
Journal or Publication Title: Fishery Bulletin
Volume: 106
Number: 3
Page Range: pp. 281-292
Date: 2008
ISSN: 0090-0656
Subjects: Biology
Ecology
Fisheries
Item ID: 8835
Depositing User: Patti M. Marraro
Date Deposited: 12 Jun 2012 17:53
Last Modified: 12 Jun 2012 17:53
URI: http://aquaticcommons.org/id/eprint/8835

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