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ICES Journal of Marine Science: Journal du Conseil 2007 64(7):1437-1443; doi:10.1093/icesjms/fsm132
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© 2007 International Council for the Exploration of the Sea. Published by Oxford Journals. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org

Just go with the flow? Route selection and mortality during downstream migration of silver eels in relation to river discharge

Henrice M. Jansen1,, Hendrik V. Winter1, Maarten C. M. Bruijs2 and Harry J. G. Polman2

1 Institute for Marine Resources and Ecosystem Studies (IMARES), Wageningen UR, PO Box 68, 1970AB IJmuiden, The Netherlands
2 KEMA Technical and Operational Services, Utrechtseweg 310, 6812 AR Arnhem, The Netherlands

Correspondence to H. M. Jansen: tel: +31 255 45646; fax: +31 255 56644; e-mail: henrice.jansen{at}wur.nl

Jansen, H. M., Winter, H. V., Bruijs, M. C. M., and Polman, H. J. G. 2007. Just go with the flow? Route selection and mortality during downstream migration of silver eels in relation to river discharge. – ICES Journal of Marine Science, 64: 1437–1443.

The European eel (Anguilla anguilla) has been in steep decline for several decades. Fisheries and hydropower-induced mortality presumably play an important role during the downstream migration of silver eels, and downstream-migrating silver eels must make various navigation and route-selection decisions to reach the sea. We examined the influence of river discharge on route selection of silver eels. To quantify the impact of hydropower and fisheries on silver eel mortality, radio-telemetry experiments were performed in the River Meuse in 2002 and 2004, surgically implanting 300 silver eels with Nedap-transponders. Route selection and passage behaviour near detection stations was assessed. Silver eels were distributed over the alternative migration routes in the river in proportion to the discharge until the silver eels reached the entrance to the turbines. The eels altered their behaviour when approaching the turbines of hydropower plants and showed stationary and recurrent behaviour. We discuss the consequences of this on route selection and mortality rates caused by hydropower facilities and fisheries.

Keywords: fisheries, hydropower, individual eel behaviour, migration, radio telemetry, river discharge, route selection, silver eels

Received 3 January 2007; accepted 19 July 2007.


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H. V. Winter, H. M. Jansen, and A. W. Breukelaar
Silver eel mortality during downstream migration in the River Meuse, from a population perspective
ICES J. Mar. Sci., October 1, 2007; 64(7): 1444 - 1449.
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