Abstract
In the article, influence of some water parameters on the distribution and growth rate of the stenothermic cold-water fish species vendace (Coregonus albula L.) and smelt (Osmerus eperlanus L.) is discussed. The volume of cold-water mass as well as water trophic stage are of a great importance to the functioning of populations of these species under natural conditions. Under thermogradient conditions, changes in the populations are being resulted in by chemical and thermal water pollution. Ichthyological research of many years has shown the volume of the thermal cold-water zone in a lake as well as water trophic stage therein, which is exhibited by change in parameters of water colour and transparency, to be essential to growth rate and age structure variations in smelt and vendace.
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