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Borghetti, J. R., V. S. G. Nogueira, N. R. B. Borghetti and C. Canzi (1994). The fish ladder at the Itaipu binational hydroelectric complex on the Parana River, Brazil. Regulated Rivers: Research and Management. 9:127-130.
A study was carried out from 23 October to 19 November 1992 to determine the ability of fish to ascend the fish ladder at the ITAIPU dam, to identify the species attracted and to evaluate possible fish selection. The results show that some species of fish can ascend the latter during the migratory period; the dam is non-selective with respect to species, but selective with respect to fish size as a result of the presence of reduced openings. The ladder was ascended by both scaly species from surface waters (agile movers) and by deep water species which were characterized by slow movements. An average of 2892 fish ascended the ladder each day. The weight and length of fish recorded ranged from 336.0 to 3676.0 g and from 30.2 to 71.3 cm, respectively. The largest group of migrating fish was the curimba Prochilodus scrofa. The high ratio of 72% of fish in the gonadal development stage, classified as "maturing", indicates that the species caught in the ladder were migrating for reproduction purposes.
U.S. Department of the Interior |
U.S. Geological Survey
URL: http://www.umesc.usgs.gov/data_library/fisheries/fish_passage/borghetti2.html
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