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ICES Journal of Marine Science: Journal du Conseil Advance Access originally published online on August 22, 2007
ICES Journal of Marine Science: Journal du Conseil 2007 64(7):1396-1401; doi:10.1093/icesjms/fsm105
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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

Experimental field study on the migratory behaviour of glass eels (Anguilla anguilla) at the interface of fresh and salt water

Tammo P. Bult and Willem Dekker

Wageningen-IMARES, PO Box 68, 1970 AB IJmuiden, The Netherlands

Correspondence to T. P. Bult: tel: +31 255 564686; fax: +31 255 564644; e-mail: tammo.bult{at}wur.nl

Bult, T. P., and Dekker, W. 2007. Experimental field study on the migratory behaviour of glass eels (Anguilla anguilla) at the interface of fresh and salt water. – ICES Journal of Marine Science, 64: 1396–1401.

European eels (Anguilla anguilla) in the glass eel phase migrate using ocean currents and selective tidal stream transport. Conventional fish ladders installed at the interface of marine and fresh water, however, require the fish to swim upstream actively. We question the efficiency of these fish ladders for glass eel immigration, and propose a simple siphon over migration barriers, restoring the original selective tidal stream transport. A conventional trap and our siphon were tested concurrently at two sluice complexes in The Netherlands (Tholen, Nieuwe Statenzijl) in spring 2005. In all but one case, the siphon caught more glass eels than the trap, as well as more sticklebacks and other species. Clearly, the natural immigration process can be restored fairly easily and at low cost and with low intrusion levels of salt. Follow-up studies should focus on optimization, and the effect of a passage on the hinterland stock.

Keywords: fish ladder, glass eel, migration, selective tidal stream transport, siphon

Received 3 January 2007; accepted 10 June 2007; advance access publication 22 August 2007.


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