Modern biological characteristics of whitefish Coregonus lavaretus, european vendace C. albula and European smelt Osmerus eperlanus from the Imandra lake

The modern biological characteristics of numerous fish species from the Imandra Lake reaches - white-fish, european vendace and european smelt was investigated. It was shown that under the conditions of the ongoing negative change in the hydrological and hydrochemical regimes of the lake over the past 20 years, there have been multidirectional changes in the population's structures of these species. If in short-cycle species (smelt, vendace) there is a positive dynamics of a number of indicators, then in whitefish these changes are negative. Euryphagia of smelt from the Imandra Lake, including the transition to preda-tion when reaching a length of 150 mm, combined with an effective breeding strategy and the virtual absence of a predator press, provide him high numbers and successful competition with other species.