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Cambray, J. A. (1990). Adaptive significance of a longitudinal migration by juvenile freshwater fish in the Gamtoos River system, South Africa. South Africa Journal of Wildlife Research. 20:148-156.
After flooding of the Groot River, the major tributary of the Gamtoos River system, during March 1988 several species of freshwater fish underwent a mass upstream migration. The dominant group of fish consisted of juvenile moggel, Labeo umbratus. There were also small-scale redfin minnows, Pseudobarbus asper, Mozambique tilapia, Oreochromis mossambicus and several chubbyhead barbs, Barbus anoplus. Fish accumulated below a weir and began to migrate late in the morning. Migration activity continued throughout the afternoon until dusk when the fish dispersed downstream. The observed movement of fish was clearly a diurnal migration. The weir had altered the general riverine habitat and influenced the natural migratory movement of fish within the Gamtoos River system. Data are presented which would be useful in the design of a fishway at this weir.
U.S. Department of the Interior |
U.S. Geological Survey
URL: http://www.umesc.usgs.gov/data_library/fisheries/fish_passage/cambray.html
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