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Legault, A. (1992). [Technical note -- study of some selectivity factors in eel ladders]. Bulletin Francais de la Peche et de la Pisciculture. 325:83-91.
Selectivity factors of eel ladders were studied just below an obstacle to eel Anguilla anguilla anadromous migration in Dordogne River. An experimental device caught 6 276 eels for 180,5 hours. The range size of eels varied from 120 to 395 mm (mean length: 223 mm) which is smaller than range size of eels caught by a neighbouring fish ladder. This result seems to show the selectivity of usual fishways. Various configurations of the experimental device allowed to test some selectivity factors. Slope and substrate factors seem to influence the efficiency. For a given slope, the eel size distribution depends on the substrate, more dense brushes involve a smaller average length of migrants. Selectivity also changes according to gradients. Slight slopes (15-30 degree) should be recommended for such devices and the substrate should be adapted to size distribution of eels in migration.
U.S. Department of the Interior |
U.S. Geological Survey
URL: http://www.umesc.usgs.gov/data_library/fisheries/fish_passage/legault.html
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