Workshop on the evaluation of northern Norwegian coastal cod harvest control rules (WKNCCHCR) ...

• Main Author: ICES
• Format: Report
• Language: unknown
• Published: ICES Scientific Reports 2022
• Subjects: Fisheries and aquaculture; Norwegian Sea ICES Ecoregion; Norwegian Sea
• Online Access: https://dx.doi.org/10.17895/ices.pub.20012459; https://ices-library.figshare.com/articles/report/Workshop_on_the_evaluation_of_northern_Norwegian_coastal_cod_harvest_control_rules_WKNCCHCR_/20012459

The workshop on the evaluation of northern Norwegian coastal cod harvest control rules (WKNCCHCR 2022) was held to evaluate proposed HCRs and to examine the basis of the Blim for the coastal cod north stock. The stock has moved from category 3 to category 1 with a SAM assessment as a result of the benchmark WKBARFAR in 2021, and there was therefore a desire to produce HCR(s) for the stock based on the new assessment. In addition, concerns had been raised over the estimation of B lim at WKBARFAR. The meeting thus covered both an examination of the model and data relevant to B lim , as well as evaluations of various HCRs. While investigating B lim it was discovered that the estimate of B lim was highly sensitive to small changes in model or data, or even to the choice to consider recruitment-at-age 2 vs. age 3. These changes moved the B lim estimate in a range between lowest and highest observed stock size and various points in between. Over the observed range of SSB recruitment had never completely collapsed ...