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Patterns of silver eel (Anguilla anguilla L.) sex ratio in a catchment

Laffaille, Pascal and Acou, Anthony and Guillouët, Jérôme and Mounaix, Béatrice and Legault, Antoine Patterns of silver eel (Anguilla anguilla L.) sex ratio in a catchment. (2006) Ecology of Freshwater, 15 (4). 583-588. ISSN 0906-6691

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Official URL: http://dx.doi.org/10.1111/j.1600-0633.2006.00195.x


Changes in the numbers and size-class structure of European silver eels, Anguilla anguilla, in the River Fre´mur (France) were examined over a 9-year period after installation of downstream eel passes. The number of silver eels migrating downstream peaked in 1999, then decreased strongly and steadily after 2000, reaching relatively low levels. At the same time, a gradual shift in the silver eel sex ratio from a dominance of males (size from 270 to 442 mm, age from 3 to 6 years) to females (size from 366 to 1112 mm, age from 4 to 9 years) was recorded. Possible explanations for the escapement patterns observed are environmental sex determination and the installation of eel passes on the main hydraulic engineering structures in 1992 and 1996.

Item Type:Article
Additional Information:Thanks to John Wiley and Sons editor. The definitive version is available at http://onlinelibrary.wiley.com/doi/10.1111/j.1600-0633.2006.00195.x/abstract
HAL Id:hal-00793405
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:Other partners > Museum National d'Histoire Naturelle - MNHN (FRANCE)
Other partners > Fish-Pass (FRANCE)
Other partners > Université de Rennes 1 (FRANCE)
Laboratory name:
Deposited On:12 Feb 2013 09:54

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