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Kotmale reservoir is the uppermost impoundment of Sri Lanka, which was constructed in 1985 under the Accelerated Mahaweli Programme, for the main purpose of hydroelectric power generation. The quality of the reservoir water has been investigated since 1987 and these results indicated that the reservoir is very sensitive towards eutrophication. The appearance of a thick Microcystis aeruginosa bloom in 1991, even at high flowthrough rates, indicated the intensity of the eutrophication process. The scope of the present investigation was to analyze the types of fish plankton interactions in the reservoir and to find out the possibility of using this information in controlling Microcystis blooms during extremely heavy blooming conditions. The field investigations carried out in the Kotmale reservoir, from March 1994 to April 1996, which include the plankton, fish and physiochemical properties of the reservoir water. To find out the rate of consumption of algal blooms by Oreochromis hybrids, feeding rate experiments were conducted in Beira Lake. (It was not possible to conduct this experiment in Kotmale reservoir, as the bloom was not a permanent situation in the impoundment).

Fish Plankton Interactions and Controlling Microcystis Blooms in the Kotmale Reservoir