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Gerem (Glass-Eel Recruitment Estimation Model): A Model to Estimate Glass-Eel Recruitment at Different Nested Spatial Scales

Abstract : Despite the importance of reliable recruitment estimates to assess eel stocks and enforce appropriate management measures, few analytical tools have been developed to estimate yearly glass-eel recruitments. Among existing models, large-scale models generally rely on strong assumptions regarding fishing activity while other models generally estimates recruitment at the river catchment scale. In this context, we develop GEREM model that aims at estimating glass-eel recruitment at different nested spatial scales. More specifically the model estimates yearly recruitments at the river catchment level and at the eel management units scale, which are two relevant spatial scales for management, and at the distribution area scale, which is consistent with the stock biological scale. The model has been applied to France and Europe on data-series lasting from 1970 to 2012 and provides trends that are consistent with current knowledge, and absolute recruitment estimates that are consistent with expert knowledge on exploitation rates.
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https://hal.inrae.fr/hal-02600771
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Submitted on : Saturday, May 16, 2020 - 5:17:14 AM
Last modification on : Tuesday, September 7, 2021 - 3:54:09 PM

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  • HAL Id : hal-02600771, version 1
  • IRSTEA : PUB00043023

Citation

Hilaire Drouineau, Cédric Briand, Patrick Lambert, Laurent Beaulaton. Gerem (Glass-Eel Recruitment Estimation Model): A Model to Estimate Glass-Eel Recruitment at Different Nested Spatial Scales. International Eel Symposium 2014: Are Eels Climbing Back up the Slippery Slope?, Aug 2014, Québec, Canada. pp.19. ⟨hal-02600771⟩

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