Kessler's sculpin
Kessler's sculpin ("Leocottus kesslerii") is a species of Baikal sculpin, a freshwater fish native to Russia and Mongolia where it occurs in Lake Baikal and surrounding lakes as well as the Selenga, Angara and Bain Gol rivers. It is the only member of its genus. In Lake Baikal it occurs on sandy, rocky-sandy or sandy-muddy bottoms, ranging from relatively shallow water to depths of . In rivers they mainly occur in slow-flowing channels and floodplains. This species grows to a total length of , but typically is . Adults are crepuscular, and feed on gammarids, chironomids , and young fish. Spawning takes place in May to June at depths. Eggs are deposited under stones, and the male stays guarding the eggs. The pelagic larvae feed on plankton. The Kessler's sculpin is sometimes caught by commercial fishers, and it is eaten by the Baikal seal, comprising about 0.3% of its diet in the winter and spring, and significantly more in the autumn.