The fishiry characteristic of perch (Perca fluviatilis L.) in some lakes of Republic Karelia

The results of studies carried out within the framework of the forecast topics (SevNIORH, SevNIIRH PetrSU) on the perch of perch and its distribution in the main commercial reservoirs of Karelia (Lake Onega, Lake Ladoga, Topo-Pyaozerо reservoir, Vodlozero reservoir, Syamozero) are presented. Studied its main structural-population indicators: size-age composition and age of puberty. The calculations of indicators of its abundance and biomass at the present stage, necessary for an objective decision of the regulation of fisheries and forecasting the catch, were carried out. Based on stable reproduction conditions on the presented reservoirs and consistency of replenishment, according to the results of calculations, the average long-term allowable catch of perch can be recommended in the amount: Lake Onega - 190 tons, Lake Ladoga (northern part) - 100 tons, Topo-Pyaozerо reservoir - 30 tons, Vodlozero reservoir - 40 tons and Syamozero - 44 tons.