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ICES Journal of Marine Science: Journal du Conseil 2006 63(4):749-765; doi:10.1016/j.icesjms.2005.12.006
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© 2006 International Council for the Exploration of the Sea

Pollock (Pollachius virens) stock structure in the Canadian Maritimes inferred from mark-recapture studies

John D. Neilsona,*, Wayne T. Stobob and Peter Perleya

a Department of Fisheries and Oceans, Biological Station 531 Brandy Cove Road, St Andrews, NB, Canada E5B 2L9
b Department of Fisheries and Oceans, Bedford Institute of Oceanography Dartmouth, Nova Scotia, Canada B2Y 4A2

*Correspondence to J. D. Neilson: tel: +1 506 5298854; fax: +1 506 5295862. e-mail: neilsonj{at}mar.dfo-mpo.gc.ca.

The current management unit for pollock on the Canadian Atlantic coast is large compared with other gadoid resources, and includes the Scotian Shelf, the Bay of Fundy, and the Canadian portion of Georges Bank. Based on an analysis of mark-recapture studies conducted in the Canadian Maritimes and off southwestern Newfoundland and a review of other published studies providing data relevant to stock identification, the stock structure of pollock in Canadian Atlantic waters was re-assessed. The analysis also includes a novel method for using the spatial distribution of standardized fishing effort to predict the distribution of tag returns. It is concluded that three stocks co-occur within the current management unit. The larger population components exist in the western Scotian Shelf (including the eastern Bay of Fundy) and on the eastern Scotian Shelf. There is a coastal population in the western Gulf of Maine that overlaps into Canadian waters, but its size is likely to be relatively small. There is a need to revise the current management unit boundaries to protect the eastern Scotian Shelf stock, which on the basis of growth rate data, appears to be the least productive component of the pollock resource in Canadian Atlantic waters.

Keywords: mark-recapture, pollock, saithe, stock

Received 11 April 2005; accepted 20 December 2005.


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