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Bellariva, J. L. and A. Belaud (1998). Environmental factors influencing the passage of Allice shad Alosa alosa at the Golfech Fish Lift on the Garonne River, France. Pages 171-179 in M. Jungwirth, S. Schmutz and S. Weiss, eds. Fish Migration and Fish Bypasses, Fishing News Books, Vienna (Austria).
Since 1973, the operation of the hydropower facility Malause-Golfech on the Garonne River (south-west France) has prevented allice shad Alosa alosa from accessing upstream spawning grounds, thus endangering the population (Cassou- Leins & Cassou-Leins, 1981). From 1981 to 1986, allice shad were captured just downstream of the power plant during their spawning migration and manually carried and released above the weir. These measures resulted in significant population increases and led to the design and installation of a fish lift near the power plant, which began operating in 1987. Since 1981, data on both environmental factors and fish passage have been recorded daily. From 1987 to 1991 and in 1993, peak migration occurred in June. In 1992, 1994 and 1995 peak migration occurred in May. In 1994 and 1995 the earlier appearance of allice shad at the Golfech passage facility was due to the disappearance of an old dam which was a brake for the migration. There was a significant correlation between daily shad passage and water temperature. The Golfech fish lift provides the means to quantitatively control the allice shad migration.
U.S. Department of the Interior |
U.S. Geological Survey
URL: http://www.umesc.usgs.gov/data_library/fisheries/fish_passage/bellariva.html
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November 3, 2015
