Do alternative assumptions for the baseline hake assessment lead to substantial changes in results

Rademeyer, Rebecca A; Butterworth, Doug S

Do alternative assumptions for the baseline hake assessment lead to substantial changes in results

Working Paper

2008

Publisher

University of Cape Town

Department

Marine Resource Assessment and Management Group

Faculty

Faculty of Science

Abstract

Results are presented for a series of sensitivities to the new baseline assessment (NBA) for the South African hake resource (Rademeyer and Butterworth, 2008). The selection of these sensitivities follows in part from issues/concerns in the assessment used for the last OMP that need further consideration in specifying Operating Models (OMs) for the next OMP revision. These include the use of catch-at-length (CAL) information for years where age-length keys (ALKs) are not available, perceptions of the relative status of the two species, the appropriateness of the survey-based algorithm to split the offshore trawl catches by species and the values of the survey constant of proportionality (from swept area estimate to total biomass in absoluter terms).

Keywords

Hake Assessment

Substantial Changes

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