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GEOGRAPHICAL AND ECOLOGICAL CHARACTERISTICS OF RAINBOW TROUT NATURALIZED POPULATION IN KAZAKHSTAN
Abstract
In the 1970s the rainbow trout species (Parasalmo (O.) mykiss Walbaum, 1792) had been introduced in Kazakhstan water bodies by three batches from Kamchatka nurseries (Russia). Investigations of condition of the introduced trout have not been performed since 1982. We conducted the field researches in two lakes and six rivers in the Almaty region (Republic of Kazakhstan) during 2015-2016. Geographical and hydrological characteristics had been studied directly during expeditions, made in six river heads, along their channels till the fishing places. We also travelled to the two high altitude lakes. We examined the rainbow trout population on the comprehensive analysis basis. The research results showed that the hydrochemical condition of investigated six mountain rivers was satisfactory. However we determined the rainbow trout presence only in three rivers of the Almaty region. The rainbow trout population level was high. Fish numbers varied with hydrochemical and trophic aquatic conditions. We tested water quality on nine physical and chemical water indicators. Biometric data of the trout bions showed a good growth and fatness according to FultonпїЅs condition factor, as well as their high reproductive potential.
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References11
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