WKLIFEXI

WKLIFEXI

Workshop 11 on the Development of Quantitative Assessment Methodologies based on Life-history traits, exploitation characteristics, and other relevant parameters for data-limited stocks

 

 

WKLIFEXIWKLIFEXITrueCarl O'BrienFRSGcarl.obrien@cefas.co.ukWorkshop 11 on the Development of Quantitative Assessment Methodologies based on Life-history traits, exploitation characteristics, and other relevant parameters for data-limited stocks

Dates to be confirmed

​​​​​Draft TORs for WKLIFE XI:

  1. For ICES stocks in Categories 5 and 6 where fishery independent time-series are not currently available, re-consider and evaluate methods for application of the Precautionary Buffer, and propose a rules-based approach to its application in advice based on life-history characteristics.
  2. The HCR for SPiCT assessments to be evaluated wrt the performance of different biomass thresholds. If defined as a fraction of BMSY, values in the range of 50-100% could be considered as a starting point for stocks with different life-history traits. The implications of an additional biomass limit reference point in the HCR should be explored.
  3. A novel data-limited HCR as an alternative to the ⅔ rule was introduced in WKLIFE X: the Bref rule. Similar to the ⅔ rule, the Bref rule aims at stabilising the biomass. However, it is based on the biomass estimated by SPiCT relative to a reference biomass (Bref) instead of raw index observations. The reference biomass could be defined as the biomass (estimated by SPiCT) at any point in time or any period of time. Preliminary results presented to WKLIFE X show a good performance in terms of the risk-yield trade-off of the rule, but further simulations are required and the performance of the method has to be correlated to the level of contrast in the available data.
  4. Explore and develop a framework for investigating risk equivalency to ensure that more uncertainty is associated with more precautionary advice across the different ICES' categories, and link to the evaluation of the value of information.
  5. Further explore and develop methods appropriate for data-limited, data-moderate and data-rich fisheries such as MERA, DLMtool and MSEtool libraries; together with emerging multispecies approaches both within and outside the ICES' community.

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WKLIFEXI

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