Baikal black grayling
A Siberian freshwater salmonid found in Lake Baikal and surrounding river systems.
The Baikal black grayling is a cold-water fish native to Siberia and northern Mongolia. It inhabits clean, oxygen-rich rivers and lakes, feeding on invertebrates and fish eggs while facing threats from dams and pollution.
- Grows up to 38 cm long and weighs 1.2 kg.
- Found in Lake Baikal and northern Mongolia's Lake Hovsgol.
- Feeds on invertebrate larvae and fish eggs on rocky bottoms.
- Introduced to Czechoslovakia in 1959 but went extinct there by 1975.
- Used as an indicator species for clean, oxygen-rich water quality.
What it is
This fish belongs to the salmon family and displays distinct coloration across its body and fins. The dorsal fin features dark olive lower halves with brick-red and green spots, while the upper half shows gray-green hues with dark-red and purple markings. A dark-red fringe lines the top edge. The body carries large copper-red spots above the ventral fin, yellow pectoral and ventral fins, and a crimson caudal fin with olive bands. Females are smaller with silver bodies and reddish tints on their rear fins. Two forms exist: riverine types and larger, rounded lacustrine versions adapted to slow-moving waters.
Where it lives
Native habitats include Lake Baikal, the Selenga River, and the Angara River within Russia’s drainage basins. The species also occupies the Yenisei River system and eastern Ob River tributaries. Northern Mongolia hosts populations in Lake Hovsgol and its connected streams. Historical attempts to introduce the fish into Europe failed; juveniles released in Czechoslovakia in 1959 disappeared by 1975 due to overfishing and lack of establishment elsewhere.
How it lives
Adults reside primarily in shallow lake areas but migrate upstream for reproduction. They feed on benthic invertebrate larvae like caddisflies and stoneflies, alongside amphipods and eggs from sculpin or lenok. This diet remains consistent throughout their life stages. The species demands cold, highly oxygenated water and serves as an indicator of ecosystem health due to high pollution sensitivity. Predators are not detailed in the provided text, though the fish itself preys on smaller aquatic organisms.
Breeding and life cycle
During spawning seasons, fish swim up tributaries to deposit eggs in soft streambed silt. They bury the eggs slightly beneath a thin sediment layer. Unlike some related salmonids, adults do not guard their offspring after laying. The process relies on specific stream conditions and clean water quality to ensure egg survival and successful hatching in the natural habitat.
Fish and people
The fish holds value as both a food source and a game fish due to its favorable texture and taste. It has appeared on old Russian postage stamps, reflecting cultural significance. Fishing pressure contributes to population declines. Conservation efforts face challenges from infrastructure development and industrial activities near habitats. The species supports local fisheries but requires careful management to sustain stocks against environmental degradation.
Status and threats
Populations are declining due to reduced water quality, dam construction, and fishing pressures. Dams block migration routes for feeding and spawning, isolating groups and restricting access to nutrient-rich downstream areas. Despite these threats, the species persists in numerous pristine lakes and rivers. Ongoing conservation monitoring tracks these changes to mitigate further loss of genetic diversity and habitat integrity.
Questions people ask about Baikal black grayling
Where does the Baikal black grayling live?
It inhabits Lake Baikal, the Selenga River, the Yenisei drainage, and Lake Hovsgol in Mongolia. It prefers shallow, rocky areas in clean, cold freshwater environments.
What does this fish eat?
It feeds on benthic invertebrate larvae such as caddisflies and stoneflies, amphipods, and eggs from other fish species like sculpin and lenok.
Is the Baikal black grayling endangered?
Populations are declining due to pollution, dam construction blocking migration, and fishing pressure. It is considered near threatened globally.
How big can it get?
Adults reach a maximum length of 38 cm and a weight of 1.2 kg. Females are typically smaller than males.
Good reading and sources
- Thymallus baicalensis on WikipediaEncyclopedia
- More photos on Wikimedia CommonsPhotos
- Wikidata recordOpen data
The facts on this page come from the Wikipedia article "Thymallus baicalensis", written by its contributors and used under the CC BY-SA 4.0 licence, and from its Wikidata record (CC0). EveryFish rewrote the text in its own words, with AI assistance, and compares every page with the article to make sure no passage is copied. It may be reused under the same CC BY-SA 4.0 licence with a link back.
It may contain mistakes, and figures change over time. Nothing here is investment or buying advice. If something is wrong, tell us. Last refreshed 2026-11-15.
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