The Baikal omul is a unique whitefish that migrates hundreds of kilometers to spawn.

Countries & Cities · Published 15 October 2026 · Updated 25 October 2026 Swipe more like this →

In short: Endemic to Siberia's Lake Baikal, the omul is a slender, silver-scaled fish that has sustained local populations for generations. Once the subject of massive commercial fisheries, this resilient species now faces a complex recovery effort as scientists work to balance its ecological needs against its status as a regional delicacy.

The omul, scientifically known as Coregonus migratorius, is a whitefish species that arrived in Lake Baikal from Arctic waters roughly 20,000 years ago. Over time, it adapted into distinct ecological forms, including pelagic, coastal, and benthic-deepwater groups. These fish are highly specialized, feeding primarily on zooplankton and the endemic alga Melosira. During winter, they employ energy-conservation strategies, resting at depths exceeding 200 meters, while in spring, they distribute themselves across layers ranging from 50 to 350 meters.

Reproduction is a rigorous process for the omul. They spawn exclusively in the rivers feeding the lake, such as the Selenga, where they may travel up to 580 km upstream. Females broadcast between 8,000 and 30,000 eggs onto hard, gravelly substrates. Incubation is a slow, cold process, lasting 180 to 200 days under ice. Because the species is iteroparous, reaching maturity between five and 15 years of age, the population is sensitive to environmental shifts and human activity.

The species has faced significant pressure from overfishing, with historical catches reaching 60,000 to 80,000 tonnes in the 1940s. Following a population crash, a commercial fishing ban was implemented in 2017 to allow for recovery. Conservationists are now monitoring fecundity—the number of eggs produced per female—as a key indicator of health. While recent data suggests that absolute individual fecundity is increasing, the lake itself remains under threat from pollution, climate change, and habitat alteration, making the long-term survival of this iconic Siberian fish a high-stakes priority for regional managers.

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