Siberian taimen

What it is

This fish belongs to the salmon family but lives entirely in fresh water. It has an olive green head that fades into a reddish brown tail. The fins on its back, bottom and tail often appear dark red, while the belly ranges from white to grey. It is the heaviest member of its group globally, surpassing North American chinook salmon in average mass. Mature specimens typically weigh between 15 and 30 kg.

Where it lives

Its territory spans vast parts of Eurasia, from the Volga and Pechora basins in the west to the Yana and Amur systems in the east. Populations exist in Russia, Kazakhstan, Mongolia and China. In Mongolia, it inhabits both Arctic and Pacific drainages, including the Yenisei, Selenga, Lena and Amur basins. The fish prefers flowing water and rarely enters lakes, usually staying near where tributaries join larger bodies.

How it lives

Adults are primarily piscivores, hunting other fish as their main food source. They also consume terrestrial animals such as rodents and birds when available. While they do not migrate to the sea, they travel significant distances within river systems during spawning periods. Home ranges in Mongolian rivers average 23 km, though some individuals cover up to 93 km. They can live for at least 55 years.

Breeding and life cycle

The species is not anadromous, meaning it does not move between salt and fresh water. However, movement rates increase notably during the spawning season. Specific details on egg laying or juvenile development are not provided in the available records, but the slow growth rate contributes to its vulnerability.

Fish and people

Anglers value it highly, particularly for fly fishing, leading to catch-and-release practices with barbless hooks in many areas. Commercial harvesting occurs, often illegally, but low market prices and slow reproduction make sport fishing more economically viable. Mongolian folklore describes a giant trapped in ice that survived winter by being eaten, then took revenge in spring. Chinese legends mention massive specimens in Kanas Lake.

Status and threats

The International Union for Conservation of Nature lists it as vulnerable and declining. Major threats include habitat degradation from mining, overgrazing, agriculture and infrastructure. Illegal fishing remains a persistent issue, especially in remote parts of Mongolia. Industrial pollution in Europe and sand extraction in China also harm populations. Conservation groups recommend international protection under migratory species conventions.

Questions people ask about Siberian taimen

Good reading and sources

• Hucho taimen on WikipediaEncyclopedia
• More photos on Wikimedia CommonsPhotos
• Wikidata recordOpen data