Further applications of statistical catch-at-age assessment methodology to the 2J3K-O Greenland halibut resource
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...
| Main Authors: | , |
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| Format: | Report |
| Language: | English |
| Published: |
University of Cape Town
2009
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| Online Access: | http://hdl.handle.net/11427/18983 https://open.uct.ac.za/bitstream/11427/18983/1/Butterworth_Further_applications_2009.pdf |
| Summary: | 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. |
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