International Council for the Exploration of the Sea
Working Group on Methods for Estimating Discard Survival (WGMEDS).pdf (2.95 MB)

Working Group on Methods for Estimating Discard Survival (WGMEDS)

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posted on 2020-04-15, 00:00 authored by ICESICES
The potential for exemption from the European Union (EU) Common Fisheries Policy’s (CFP) landing obligation (discard ban), where high discard survival can be demonstrated, has identi-fied the need for scientific guidelines to conduct discard survival assessments. Robust estimates of discard survival can be used to justify exemptions from the landing obligation and inform on levels of post-release fishing mortality, which can then be accounted for in stock assessments.The Working Group on Methods for Estimating Discard Survival (WGMEDS) set out to review and update ICES guidance on Methods to Estimate Discard Survival and complete meta-anal-yses of discard survival evidence to investigate variables influencing survival, with a view to influencing survival through modified fishing practices. We also explored the demand for ongo-ing monitoring requirements to inform on discard survival and took a proactive approach to sharing discard survival estimates with those working in stock assessment so that new evidence could be applied more widely.In the past three years, the considerable investment in research in to discard survival, specifically from EU countries, has continued. The main outputs from WGMEDS include enhancements to the ICES guidance on how to quantify discard survival. This has supported the work of group members to estimate discard survival in a variety species-fishery combinations, including Nephrops, mackerel, plaice, common sole, eels, rays, much of which has been put forward as evidence to support exemptions from the EU discard ban. A critical review framework devel-oped by WGMEDS has been used by the EU Scientific, Technical and Economic Committee for Fisheries (STECF) to assess the quality of discard survival evidence for proposed exemptions. There has been a high impact of work produced by the members of the group – specifically in multiple new EU regulated exemptions from the landing obligation. This has permitted fishers to continue discarding defined species and so assisting the implementation of the EU discard ban.Future work is expected to focus on applying discard survival estimates in stock assessments. This would include developing guidance to assist assessment expert groups to determine whether available survival studies can be applied. It would require reviewing and assessing the quality and confidence in available discard survival estimates and exploring the potential to combine the results of survival studies so the effect of different variables could be accounted for in estimating an overall best survival estimate. Ultimately, we would aim to include estimates of discard survival in catch scenarios in the ICES advice sheets.


Published under the auspices of the following ICES Steering Group or Committee


Published under the auspices of the following ICES Expert Group or Strategic Initiative



ICES Scientific Reports





Contributors (Editors)

Tom Catchpole; Sebastian Uhlmann

Contributors (Authors)

Tom Catchpole; Sebastian Uhlmann; Mike Breen; Catarina Adão; Luis Arregi; Hugues Benoît; Aida Campos; Margarida Castro; Keno Ferter; Junita Karlsen; Barbara Koeck; Dorothée Kopp; Sarah B.M. Kraak; Niels Madsen; Ana Marçalo; Matthew McHugh; Sonia Méhault; Pieke Molenaar; Marie Morfin; Martin Oliver; Iñigo Onandia; Ignacio Ruiz-Jarabo; Esther Savina; Barbara Serra-Pereira; Maria Tenningen; Mickael Teixeira Alves; Daniel Valentinsson; Noémi Van Bogaert; Noor Visser; Noëlle Yochum



Recommended citation

ICES. 2020. Working Group on Methods for Estimating Discard Survival (WGMEDS; outputs from 2019 meeting). ICES Scientific Reports. 2:8. 75 pp.