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The old system of cultivating several species of tilapia together in the same pond has been changed to monospecies culture. Oreochromis andersonii has been shown to yield good growth and production rates.
An outline is given of measures taken to manage the Kariba fishery and problems encountered. The industrial Limnothrissa miodon fishery and the artisanal gillnet fishery are discussed.
A brief account is given of parasites affecting tilapia and carp, covering helminths, bacteria and protozoa. Effects onproduction of culture species are considered in particular, indicating precautions to be taken to reduce possibility ofdisease.