Ludoga whitefish is a subspecies of common whitefish, which lives in the cold waters of Ladoga and Onega lakes. The word "ludoga" comes from "lud", which means a stony area under the water, this fish prefers such areas, hence the name of the subspecies. Its appearence is distinguished by a small head, thinner in the front. It has a protruding upper jaw, which forms a convex nose. Its eyes are silvery. It feeds on small crustaceans, mollusks, fish roe. Its body length is from 30 to 50 cm, average weight amounts to 800-900 g.