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

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