Research Document - 1999/079

Reconstruction of B.C. sablefish stocks, 1996-1998 and catch projections for 1999, using an integrated catch-age recapture model with area and depth movement.

By V. Haist, D. Fournier and M.W. Saunders

Abstract

This paper represents a major assessment for sablefish. The assessment is based on an integrated catch-age, mark-recapture model that is stratified by area and depth. The unified approach is a significant improvement over the previous assessment that analyzed catch-at-age and tagging data separately. Estimates of available biomass in 1997 range from 43,400 to 51,300t. A recommended yield range of 2,977t-5,052t was developed based on deterministic projections using varying levels of recruitment and target F levels based on the current F (Current), 0.8F(currrent) and 1.2F(current) . Under all scenarios with average or below average levels of recruitment the stock is predicted to decline slowly. We recommend a yield level be chosen from low-average recruitment options.

 Complete PDF document
46 pages (3845K)

Accessibility Notice:

This document is available in PDF format. If the following document is not accessible to you, please contact the Secretariat to obtain another appropriate format, such as regular print, large print, Braille or audio version.

Offer to produce in both official languages:

This report uses scientific and technical terms and is published in the official language of the working group or scientific expert that produced the document. If this document is not accessible to you in the official language of your choice, please contact the Secretariat.

Date modified: