Study

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

  • Published source details Bult T.P. & 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.

Actions

This study is summarised as evidence for the following.

Action Category

Install siphon fish passes

Action Link
Eel Conservation in Inland Habitats
  1. Install siphon fish passes

    A replicated study in 2005 in two rivers in the Netherlands (Bult & Dekker 2007) found that siphon fish passes at locks were used by European glass eels Anguilla anguilla to travel upstream. Glass eels were captured exiting the siphon passes during each of 13 surveys (51,542 eels/survey) at one site, and 12 of 13 surveys (176 eels/survey) at the other site. Overall, greater numbers of glass eels were captured exiting siphon passes (01,452 eels/survey) than in eel traps placed in front of each lock (0262 eels/survey). In spring 2005, a siphon fish pass (110-mm PVC pipe with vacuum pump and control valve) was installed over a navigational lock in each of two rivers, at the edge of estuaries. A conventional eel trap (1.5 x 1 x 1 m floating plastic container with freshwater pumped into it) was placed in front of the lock gates at each site. In AprilMay 2005, eels were captured in nets placed over the upstream end of the siphon passes and in the eel traps during 1213 surveys over 10 nights (10 surveys at high tide, 23 surveys at low tide). 

    (Summarised by: Anna Berthinussen)

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