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Borghetti, J. R., D. P. Chena and S. V. G. Nogueira (1993). Installation of a fish migration channel for spawning at Itaipu. International Water Power and Dam Construction. 45:24-25.
A fish migration channel for spawning at the Itaipu (Brazil and Paraguay) hydroelectric station was installed to improve fish recovery downstream from the dam. The complex had caused a significant reduction in the spawning area, with a deleterious effect on the reproductive cycle of the native species. An experimental model of a fish migration channel was installed, having a system of 'tank steps' at the foot of the dam, a sheet-metal ladder, a serpentine-style channel for the spawning of the fish, and two marginal lagoons for incubation of the eggs and growth of the larvae. The return migration of the hatchlings will be made through a trough linking the marginal lagoons directly to the Parana River. The first phase of the project is formed by a 56-m-long ladder. Preliminary data from the first phase has proved that fish (3000/day) of tropical climates can ascend ladders exceeding 8 m. The results of the first phase indicate the efficiency of the experimental project, with the entry and ascendancy of fish in a migration channel ladder. These data now provide the technical basis for implementation of the complementary spawning channel stage.
U.S. Department of the Interior |
U.S. Geological Survey
URL: http://www.umesc.usgs.gov/data_library/fisheries/fish_passage/borghetti.html
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