СОСТАВ И СТРУКТУРА ИХТИОЦЕНОЗОВ КРУПНЫХ ПРИТОКОВ РЕКИ КАМА

In this article reported results of investigation of ichthyofauna from two largest tributaries of the Kama river – Vyatka and Belaya. During the study was observed the dynamics of species composition, quantitative fi sh change of the dominant over the years. Species diversity index is calculated according to Shannon. Presented size and age structure of fi sh populations. Ichthyocenosis investigated for the features of the ecological structure of food-type, timing of spawning and use of spawning substrate. It is shown that the ichthyocenosis reaction for conditions of the environment is a simplifi cation of the ecological structure of all environmental groups. Due to trophic specialization in the studied reservoirs for fi sh noted the lack of herbivores and the dominance of benthic feeding, spring-spawning domination on terms of spawning, and on the use of spawning substrate dominance of phytophilic species.