Abstract
The study of ecological groups of hydrobionts has scientific importance due to the tasks of industrial production of aquatic bio resources and environmental protection of a unique natural object under the protection of UNESCO — Lake Baikal. In the biota of Lake Baikal, gammarids and fish have a significant share of the biomass and play an extremely important role in the food chains. They utilize primary and partially secondary products and are themselves objects of fishing. Under the conditions of increasing industrial pollution of the Baikal water area, hydrobionts also act as indicators of the presence of pollutants. The dynamics of the abundance of hydrobionts of various ecological groups in relation to the impact of the illumination factor is an important indicator of the ecological state of a reservoir. We have reviewed research studies on the effect of illumination on the behavior of aquatic organisms. The results of the work can be used in choosing the conditions for growing production fish at different stages of its ontogenesis.
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