Further applications of statistical catch-at-age assessment methodology to the 2J3K-O Greenland halibut resource
Working Paper
2009
Permanent link to this Item
Authors
Journal Title
Link to Journal
Journal ISSN
Volume Title
Publisher
Publisher
University of Cape Town
Faculty
License
Series
Abstract
The initial applications of statistical catch-at-age analysis to commercial catch and survey information in Butterworth and Rademeyer (2009a) are updated to take temporal variability in survey selectivity-at-age into account, and an associated updated Baseline assessment B2 is developed. Sensitivity of the results of B2 to a wide range of alternative specifications is explored. Generally results are more positive than for the most recent XSA assessment. However the SCAA results are not entirely satisfactory because of a conflict evident between survey trends and the proportions-at-age data, which underlies the wide-ish range of results that can be obtained. The overall impression gained from these analyses is that the status of the 2J3K-O Greenland halibut resource is less robustly determined than might be inferred from past XSA assessments.
Description
Reference:
Butterworth, D. S., & Rademeyer, R. A. (2009). Further applications of statistical catch-at-age assessment methodology to the 2J3K-O Greenland halibut resource. MARAM: University of Cape Town.