ICES Journal of Marine Science: Journal du Conseil Advance Access originally published online on August 25, 2007
ICES Journal of Marine Science: Journal du Conseil 2007 64(7):1444-1449; doi:10.1093/icesjms/fsm128
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Silver eel mortality during downstream migration in the River Meuse, from a population perspective
1 Institute for Marine Resources and Ecosystem Studies (IMARES), Wageningen UR, PO Box 68, 1970AB IJmuiden, The Netherlands
2 RWS–RIZA, PO Box 17, 8200 AA Lelystad, The Netherlands
Correspondence to H. V. Winter: tel: +31 255 564646; fax: +31 255 56644; e-mail: erwin.winter{at}wur.nl
Winter, H. V., Jansen, H. M., and Breukelaar, A. W. 2007. Silver eel mortality during downstream migration in the River Meuse, from a population perspective. – ICES Journal of Marine Science, 64: 1444–1449.The European eel (Anguilla anguilla) population has decreased sharply over the past few decades owing to a combination of many factors. To determine the impact of hydropower and fisheries during the downstream migration of silver eel in the River Meuse, telemetry experiments were performed during the years 2002–2006, using 18 detection stations (NedapTrail-System®) in the river and two at the entrance to the hydropower turbines. Recaptures in fisheries were used to assess fisheries mortality. In all, 300 silver eels were surgically implanted with Nedap-transponders. For each stretch between subsequent stations, mortality rates were assessed and related to the different factors. However, to determine the overall effect on the escapement of silver eels from the River Meuse, insight into the distribution of silver eels in the entire catchment of the River Meuse is required. At two locations, mark-recapture experiments in 2002 revealed that the estimated number of migrating silver eels increased strongly in a downstream direction, suggesting that a large proportion of silver eels start their migration from the downstream stretches and tributaries of the River Meuse. Approaches and monitoring requirements that can be used to determine the impact on silver eel populations in a river basin are discussed.
Keywords: fisheries, hydropower, migration, mortality, silver eel, telemetry
Received 3 January 2007; accepted 18 July 2007; advance access publication 25 August 2007.
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  H. M. Jansen, H. V. Winter, M. C. M. Bruijs, and H. J. G. Polman Just go with the flow? Route selection and mortality during downstream migration of silver eels in relation to river discharge ICES J. Mar. Sci., October 1, 2007; 64(7): 1437 - 1443. [Abstract] [Full Text] [PDF]
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