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Workshop for the Technical evaluation of EU Member States' Progress Reports for submission in 2021 (WKEMP3)

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posted on 2022-05-30, 09:25 authored by ICESICES


The Workshop for the Technical evaluation of EU Member States’ Eel Regulation Progress Reports (WKEMP3) prepared and reviewed scientific analyses to provide material to answer a special request from the European Commission. The report reviews, compiles and analyzes data and information received by ICES. In most instances, data gaps and inconsistencies curtailed evaluation of the effectiveness of Eel Management Plans, management measures, and monitoring programs. 

Employing best available data and analyses in assessing EMU trends, WKEMP3 concludes that in most EMUs escapement and mortality are still far from the explicit or implicit Regulation targets. In addition, there is no evidence that escapement is increasing, as combined trends submitted by countries show a slight decreasing trend, and anthropogenic mortality remains generally high having decreased only in a limited number of EMUs.

Biomass indicators, as reported by the member states, suggest that the management target of 40 % of pristine silver eel escapement (Bcurrent/B0 ≥ 0.4) has been achieved in 10 of 53 reporting EMUs, which is less than in the initial year of reporting (20 of 53). Relative trends suggest that escapement is lower today as compared to the initial year of reporting in 41 of the reporting EMUs escapements. The biomass target implies a lifetime anthropogenic mortality of ΣA = 0.92. In 38 of 49 reporting EMUs ΣA is lower than the implicit mortality target compared to 35 of 49 that were below in the initial year of reporting. In 25 EMUs mortalities are lower currently as compared to the initial reporting, whereas an increase was reported for 19 EMUs.

Progress on implementing management measure is continuing for commercial and recreational fisheries, and trade; hydropower, pumping stations and obstacles; restocking; habitat improvement; governance; and scientific monitoring. A total of 762 measures (75% of the total) were deemed fully or partially implemented. The variation and gaps in the data submitted made it extremely challenging to determine the effectiveness of reported measures in the context of associated threats. In many instances, measures were not designed to be evaluated directly by biomass and mortality indicators. Ultimately, local expertise and adaptive monitoring and assessment plans of each EMU are needed to evaluate measure effectiveness. 

Biomass and mortality indicators were not reported by all countries and those who reported had inconsistencies, mostly about whether and how restocking was included in the estimation of indicators, how pristine recruitment was estimated, and what estimation methods were used. This makes it difficult to reach conclusion for the whole stock. In addition, management targets are not consistently calculated which further impairs comparison between EMUs and evaluation of the status of the whole stock.

An analysis of the methods used to build the biomass and anthropogenic mortality indicators led to grouping the methods by type and evaluated possible threats and biases associated with each group. In the short term, using common methods to estimate anthropogenic mortalities should be possible and these should be applied for the next evaluation of the EU Member States progress report under the Eel Regulation in 2024. In the long-term, biomass, including pristine biomass, should be estimated using common methods and approaches, to make the comparison between countries possible. 

[The following text in italics was agreed by the ADGEMP as an amendment to the report]
Management measures influence mortality directly, whereas the possibility to influence biomass for a single EMU are limited and strongly depend on recruitment which, in turn, depend on the progress made in all countries in the eel range. Mortality targets should be explicitly agreed in addition to the biomass escapement target and focus on the management should be on mortality targets.


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

  • FRSG

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



ICES Scientific Reports





Contributors (Editors)

Jean-Jacques Maguire; Cedric Briand; Hilaire Drouineau; Matthew Gollock; Jan-Dag Pohlmann; David H. Secor

Contributors (Authors)

Tea Basic; Antoine Bigot; Cedric Briand; Estibaliz Diaz; Hilaire Drouineau; Rob van Gemert; Tessa van der Hammen; Matthew Gollock; Marko Freese; Katarzyna Janiak; Jean-Jacques Maguire; Inigo Martinez; Jiří Musil; Jan-Dag Pohlmann; Argyrios Sapounidis; David H. Secor; Niki Sporrong; Nurbanu Partal; Sami Vesala; Sukran Yalcin Ozdilek; Ciara O’Leary.



Recommended citation

ICES. 2022. Workshop for the Technical evaluation of EU Member States' Progress Reports for sub-mission in 2021 (WKEMP3). ICES Scientific Reports. 4:41. 177 pp. http://doi.org/10.17895/ices.pub.19768585