Journal Article

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

Tammo P. Bult and Willem Dekker

in ICES Journal of Marine Science

Published on behalf of ICES/CIEM

Volume 64, issue 7, pages 1396-1401
Published in print October 2007 | ISSN: 1054-3139
Published online August 2007 | e-ISSN: 1095-9289 | DOI: http://dx.doi.org/10.1093/icesjms/fsm105
Experimental field study on the migratory behaviour of glass eels (Anguilla anguilla) at the interface of fresh and salt water

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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

Journal Article.  3877 words.  Illustrated.

Subjects: Environmental Science ; Marine and Estuarine Biology

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