Current State of the Population of a Large-Sized Form of the Vendace Coregonus albula (L.) Introduced into Lake Pertozero, South Karelia

We have analyzed species composition of the fish population of Lake Pertozero, Lake Onega basin, and the results of the introduction of a large-sized form of the European vendace Coregonus albula into the lake. The time taken for the naturalization and formation of the vendace brood stock in the lake was calculated. The features of biology of introduced vendace under new conditions (age composition, linear-weight growth; feeding, fecundity and reproduction) was studied. It was shown that the lake is conducive to the existence of large-sized vendace, as indicated by hydrological, hydrochemical, and hydrobiological indices. We have also shown that the high potential of the species and favorable conditions in the lake have contributed to its successful naturalization in the lake. The large-sized form of vendace introduced into Lake Pertozero has formed a new abundant population and has become the dominant species.