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Omul
The omul, ''Coregonus migratorius'', also known as Baikal omul ((ロシア語:байкальский омуль)), is a whitefish species of the salmon family endemic to Lake Baikal in Siberia, Russia. It is considered a delicacy and is the object of one of the largest commercial fisheries on Lake Baikal. In 2004, it was listed in Russia as an endangered species.
==Taxonomy==
The omul has traditionally been regarded as a subspecies of the Arctic cisco ''Coregonus autumnalis''. However, recent genetic studies have shown it actually belongs to the circumpolar ''Coregonus lavaretus-clupeaformis'' complex of lake whitefishes, which also has other members in Lake Baikal, and it is now considered its own species within ''Coregonus''.〔 The four or five traditionally accepted subpopulations of omul within Lake Baikal are: North Baikal (северобайкальский), Selenga (селенгинский), Chivyrkui (чивыркуйский) and Posolsk (посольский). These vary in size, feeding behaviors and preferred spawning habitats. The extent of their reproductive isolation is debated.
==Description==
The omul is a slender, pelagic fish with light silver sides and a darker back. It has small spots on its dorsal fin and larger ones on its head, a terminal mouth and a large number of gill rakers, typical of fish that feed in the pelagic zone.〔 The mean size of adults is 36–38 cm and 0.6 to 0.8 kg, though the maximum reported length is 56 cm weighing about 2.5 kg. The subpopulations on the northern end of the lake tend to be smaller.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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