Predation on migrating eels (Anguilla anguilla L.) from the Western Mediterranean

H. Westerberg*, E. Amilhat, M. Wahlberg, K. Aarestrup, E. Faliex, G. Simon, C. Tardy, D. Righton

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Abstrakt

Nineteen female silver European eels (Anguilla anguilla L.) were tagged with satellite tags and released in the Gulf of Lion in the Mediterranean during the migration seasons 2013 and 2015. Sixteen tags transmitted data: five in the Atlantic Ocean, and eleven in the Mediterranean. Of those, 50% of migrating eels were consumed by marine mammals in each year, all in the Mediterranean. The diving behaviour recorded by the tags after the eels were consumed indicated that the most likely predators were deep diving toothed whales. Measurements of the acoustic target strength of the tag showed a negligible effect on the detectability by whale biosonar. Overall, the observed predation rate was similar to that reported for eels escaping into the Atlantic. However, unlike eels in the Atlantic, which are most vulnerable to predators in the first week of escapement as they traverse the continental shelf and before they reach the refuge of the deep ocean, eels escaping from the Mediterranean were predated in deep water, months after release, likely as a consequence of their migration within a relatively narrow and deep corridor in the Alboran Sea. This emphasises the challenge of accounting for natural mortality in management plans for the long-term recovery of the European eel.

OriginalsprogEngelsk
Artikelnummer151613
TidsskriftJournal of Experimental Marine Biology and Ecology
Vol/bind544
Antal sider9
ISSN0022-0981
DOI
StatusUdgivet - nov. 2021

Bibliografisk note

Funding Information:
Thanks to the professional fishermen from the lagoons of Salses-Leucate, Gruissan, Thau and Petite Camargue who provide the eels and helped us to release the tagged eels at sea; to R. Certain from the CEFREM, to E. Fabre and T. Scourzic from Seaneo and to the CRPMEM-Occitanie for their support in the logistic. This work was funded by the French Ministry of Agriculture and Food. DR was provided with learning and development support from Cefas to contribute to the writing of this manuscript.

Funding Information:
Thanks to the professional fishermen from the lagoons of Salses-Leucate, Gruissan, Thau and Petite Camargue who provide the eels and helped us to release the tagged eels at sea; to R. Certain from the CEFREM, to E. Fabre and T. Scourzic from Seaneo and to the CRPMEM-Occitanie for their support in the logistic. This work was funded by the French Ministry of Agriculture and Food. DR was provided with learning and development support from Cefas to contribute to the writing of this manuscript.

Publisher Copyright:
© 2021 The Authors

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