Omul (Coregonus autumnalis) is a passage fish of the whitefish family. The mouth is terminal, with 35-51 gill stamens. Body length reaches 60 cm and weight - 3 kg. It inhabits the Arctic Ocean basin from Pechora to Alaska and Northern Canada. Omul fattens up in the coastal parts of the Arctic Ocean and rises to spawn in the rivers of Russia, Alaska and Canada. In the sea it feeds on large benthic crustaceans, juvenile fish and small zooplankton. In Lake Baikal, the subspecies is the Baikal omul, characterized by large eyes and a large number of gill stamens. Traditionally considered as subspecies Coregonus autumnalis migratorius, according to genetic studies it is close to the common and herring whitefish and was separated into a separate species Coregonus migratorius. It has 3 ecomorphological groups. It reaches sexual maturity in the sixth to eighth year of life. Breeds non-annually. For spawning rises to rivers 1000 km and more. Spawning in October. Fecundity 11-67 thousand eggs Feed mainly on crustaceans and young fish. It is an important object of fishery.