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Characterization of the fishery assemblages in a suite of eutrophic and hypertrophic South African dams
Expanded Title:Work done within this project examined the fish assemblages of six dams to examine the hypothesis that impounded eutrophic waters tend to be dominated by coarse fish. It was hypothesised that the ecological state and water quality of eutrophic dams could be improved through the re-shaping of imbalanced fish populations, brought about by the deliberate harvesting of target species. In this project fish assemblages in six dams of known trophic status in the same region were examined. The fish biomass in all of the dams was dominated by sharptooth catfish. By contrast, the contribution made by common carp was less than expected. The canary kurper was numerically-dominant in two dams. Fish assemblages of South African dams are fundamentally different to those occurring in lakes where biomanipulation has been successful. All of the dams supported fish populations that exceed areal biomass levels commonly associated with a swing towards algal dominance.
Date Published:01/01/2011
Document Type:Research Report
Document Subjects:Ecosystem - Invertebrates
Document Format:Report
Document File Type:pdf
Research Report Type:Standard
WRC Report No:1643/1/10
ISBN No:978-1-4312-0054-2
Authors:Harding WR; Koekemoer JH
Project No:K5/1643
Originator:WRC
Organizations:DH Environmental Consulting; Koekemoer Aquatic Services
Document Size:5 560 KB
Attachments:EXECUTIVE SUMMARY for 1643.pdf
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