Groundfish stock assessments for the west coast of Canada in 1985 and recommended yield options for 1986 / by A.V. Tyler, R.P. Foucher and J. Fargo (editors). : Fs97-4/1897E-PDF

"Stock assessments and yield options are developed for the Pacific coast of Canada for the following species: lingcod, Pacific cod, Dover sole, rock sole, English sole, sablefish, Pacific hake, spiny dogfish, walleye pollock, Pacific ocean perch, yellowmouth rockfish, rougheye rockfish, silvergrey rockfish, yellowtail rockfish, and canary rockfish. This is an interim report with assessments largely based on mathematical analyses presented in Tyler and McFarlane 1985, and interpreted with 1985 landing statistics. The yield options are recommendations to the fishery managers of the Field Services Division on catch limitations and other fishery management procedures. Biological considerations only, rather than economic factors, are addressed in this document. The yield options are quantitative and are based on a series of appropriate mathematical methods, e.g., virtual population analysis, dynamic pool analysis, and Fournier stock-reconstruction procedures. Alternative options address the possibility of the fishery managers considering high risk and low risk yields in relation to a stock's future potential to produce. Other options, particularly for rockfish and flatfish species, provide a selection of alternatives for managers to consider in regard to whether a stock should be re-built, maintained at status quo, or decreased through non-sustainable catches for present economic emergencies"--Abstract, page v.

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