Workshop on Data-limited Stocks of Short-lived Species



WKDLSSLSWKDLSSLSTrueAlexandros Kokkalis, Andrés UriarteFRSGalko@aqua.dtu.dk, auriarte@azti.esWorkshop on Data-limited Stocks of Short-lived Species

The Workshop on Data-Limited Stocks of Short-Lived Species 2 will further develop methods for stock assessment and catch advice for short-lived stocks in categories 3–4, focusing on the provision of advice rules that are within the ICES MSY framework.

On the basis of the outcome of WKLIFE7, WKLIFE8, WKLIFE9. WKSPRAT 2018, WKSPRATMSE 2018 and WKDLSSLS 2019, the following issues should be addressed:

  1. Test different assessment methods for data-limited short-lived species (seasonal SPiCT, others) and provide guidelines on the estimation of MSY proxy reference points for category 3–4 short lived species.
    1. Further work on assessment methods of initial stock status relative to MSY with simpler analyses of historical catches, the abundance indices, or from expert knowledge where it is relevant.
    2. Further testing of SPiCT advice rules for management for short-lived species. Evaluation of the performance of these rules either alone or in combination with uncertainty caps and biomass safeguards.
  2. Further explore the appropriateness of the management procedures currently in use for short-lived species by means of Long-Term Management Strategy Evaluations (LT-MSE). This will involve:
    1. Revisiting, if required, the advice rules proposed in WKDLSSLS 2019
    2. Testing the effectiveness of the precautionary buffer in mitigating the short-term risks associated with the new harvest control rules being tested.
    3. Further exploring the benefits of adding a biomass safeguard of minimum observed index or at a quantile of the index series to the rules either alone or in combination with uncertainty caps.
    4. Revisiting, if necessary, the suitability and magnitude of the uncertainty caps explored in WKDLSSLS2019, including further testing of asymmetric uncertainty caps with variable upper and lower bounds, or assessing  the effect of shifting the uncertainty cap levels in time.

Constant or variable harvest rate strategies instead of the trend-based rules (aligned with HCR 3.2.2 Catch rule based on applying an Fproxy–WKMSYCat34).

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