Ilmast, N. V., Sterligova, O. P., Milyanchuk, N. P. BIOLOGICAL INDICATORS OF COREGONID FISH SPECIES IN LAKE TULOS (WESTERN KARELIA) // Proceedings of Petrozavodsk State University. 2018. No 8 (177). DOI: 10.15393/uchz.art.2018.246


General Biology

BIOLOGICAL INDICATORS OF COREGONID FISH SPECIES IN LAKE TULOS (WESTERN KARELIA)

Keywords:
: freshwater ecosystems
biological diversity
ichthyofauna
coregonid species
ecological form		 Summary: Coregonid fish are valuable commercial species in northern freshwater ecosystems. The relevance of the work is determined by the decrease in their stocks as a result of human activities. The aim of the study was to study the biology of coregonid species in Lake Tulos (Republic of Karelia) and assessment of the water body in terms of its fisheries management. The assessment of the lake ecosystem is given. It is shown that the reservoir belongs to the alpha-oligotrophic type. The fish population of the lake is represented by 14 species. Data on the state of coregonid species in water body in the paper are presented. The fish of the family Coregonidae in the water body are represented by the European vendace Coregonus albula and whitefish C. lavaretus. The vendace of Lake Tulos belongs to the small form, the growth rate of which is close to that of the small forms from other lakes of Karelia. According to the number of gill rakers, 2 ecological forms of whitefish inhabit the lake: a medium-rakered form (29-37 rakers) and a densely rakered form (47-60 rakers). Fish differ significantly in all biological indicators. It is noted that the complexity of the ichthyofauna of northern ecosystems is achieved not only by the number of species, but also by the abundance of various ecological forms. To preserve the species diversity of the fish population of the water body, it is advisable to introduce regulated fishing on it.



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