Report of the 2011 Session of the Joint EIFAAC/ICES Working Group on Eels, Lisbon, Portugal, 5-9 September 2011
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FAO/ICES ;
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This report summarizes the presentations, discussions and recommendations of the 2011 session of the Joint EIFAAC/ICES Working Group on Eel which took place in Lisbon, Portugal, hosted by the University of Lisbon (Faculdade de Ciências, Univer-sidade de Lisboa), from 5 to 9 September 2011. In this section, the main outcomes from the report are summarized, a forward focus is proposed in the light of observed declines in many Anguillid stocks and the imple-mentation of the EU Regulation for the Re covery of the Eel Stock and the main rec-ommendations are presented by WGEEL. The Working Group in 2011, along with Study Group on International Post-Evaluation on Eels (SGIPEE), has focused on six main themes, updating the recruit-ment and stocking time-series, including a power analysis on the ability to detect a change in recruitment or silver eel output, a discussion on biological reference points and setting reference biomass and mortality limits, providing support for local popu-lation ass essments especially in describing anthropogenic mortalities, updating the EEQD and making preliminary assessments of spawner quality and making some observation on eel and the Marine Strategy Framework Directive. The objective of eel stock assessment is to quantify the biomass of silver eel escaping in order to assess compliance with the EU target of 40% of pristine biomass without anthropogenic mortality. Given that it will be impractical to directly assess silver eel biomass and mortality in m any rivers, yellow eel stock assessment will also be re-quired. In conjunction with SGIPEE and pilot projects to estimate potential and ac-tual escapement of silver eel (POSE), the Working Group has identified a number of areas where gaps in knowledge existed (i.e. silver eel assessment, yellow to silver transformation, quantification of habitat) and focused on these in order to provide support for local stock assessments. To fill the gap between implemented reductions in mortality and the subse quent changes in silver eel biomass, it is also recommended that a measure of lifetime anthropogenic mortality be determined.