Migration behaviour and escapement of European silver eels from a large lake and wetland system subject to water level management (Grand‐Lieu Lake,France): New insights from regulated acoustic telemetry data |
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| Authors: | Thomas Trancart Eric Feunteun Valentin Danet Alexandre Carpentier Virgile Mazel Fabien Charrier Morgan Druet Anthony Acou |
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| Affiliation: | 1. UMR 7208 BOREA (Biologie des Organismes et Ecosystèmes Aquatiques), Sorbonne Université, MNHN, CNRS, UMPC, Université Caen, Univ Antilles Guadeloupe, IRD – Station Marine de Dinard – CRESCO, Dinard, France;2. EA 7462 Géoarchitecture Territoires Urbanisation Biodiversité Environnement, Université de Rennes 1, Rennes Cedex, France;3. Fish‐Pass, Bureau d’études expert en ichtyologie appliquée, Laillé, France |
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| Abstract: | Current knowledge about the downstream migration of sexually mature European eels (Anguilla anguilla) remains incomplete, particularly in still water habitats such as lakes and wetlands subject to water level management. However, for the management of this endangered species, it is important to understand migration dynamics, and contribution to the breeding stock. This study aimed to assess the parameters that trigger and guide the migration of silver eels in the largest floodplain lake and associated wetlands in France (the sluice regulated Grand‐Lieu Lake). A telemetry survey of 50 acoustic and PIT‐tagged female silver eels was performed during the 2015–2016 migration period. We deployed a novel telemetric approach, using receivers to delimit several restricted virtual boxes to determine the instantaneous location of individuals and to transform simple discrete telemetric data into presence/absence data. The low numbers leaving the lake centre are probably explained by the lack of orienting water flows or other environmental clues, but whilst the fate of 34% (17/50) of the tagged eels is unknown, 18% (9/50) were caught by commercial fishermen. Modelling showed that detections were not clearly associated with environmental factors typically involved in riverine migrations (e.g. current velocity, atmospheric pressure and temperature) but they were particularly associated with higher and increasing water levels and, for eels exiting the lake, a sharp increase when sluice gates were opened to an effective gap of >75 cm. It is concluded that management of water levels and sluice gate opening during the migration period might aid escapement of silver eels. |
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| Keywords: |
Anguilla anguilla
cues silver eel migration triggers |
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