Upper Midwest Environmental Sciences Center
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Peter, A. (1998). Interruption of the river continuum by barriers and the consequences for migratory fish. Pages 99-112 in M. Jungwirth, S. Schmutz and S. Weiss, eds. Fish Migration and Fish Bypasses, Fishing News Books, Vienna (Austria).
The following contribution summarises the results of several small studies, and uses a short literature review to emphasise the importance of barrier-free streams in maintaining populations of both salmonid and non-salmonid fish species. The effect of a high (6.5 m) and a very low obstacle (40 cm) on the fish fauna in two Swiss rivers was documented. A considerable loss of fish species was observed in stream reaches above the barriers. Surveys of small artificial barriers in several Swiss river systems demonstrate the density of these potential migration obstacles. Movements of brown trout Salmo trutta and rainbow trout Onchorhynchus mykiss were shown over diel, seasonal and an annual time scale using radio-telemetry. Non-salmonid fish species, typically thought of as resident, also undergo extensive movements and therefore depend on barrier-free streams to maintain their distribution. Like salmonids, cyprinids and small-sized fish species depend on an intact river corridor that allows migration, habitat shifts and survival of the population. In order to maintain and restore biodiversity, there is an urgent need to restore the longitudinal integrity of running waters.
U.S. Department of the Interior |
U.S. Geological Survey
URL: http://www.umesc.usgs.gov/URL: http://www.umesc.usgs.gov/data_library/fisheries/fish_passage/peter.html
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