taimen

The taimen, scientifically known as Hucho taimen and commonly referred to as the Siberian taimen, is a large freshwater fish in the salmonid family. It is native to river systems in Siberia, Mongolia, and the Amur basin of East Asia. The species is among the largest freshwater fishes, with individuals reported up to about 1.5–2.0 meters in length and weighing tens of kilograms; exceptional specimens may exceed 100 kilograms.

Physically, taimen have an elongated body, a broad snout, and a large mouth filled with sharp teeth. Coloration varies by age and habitat, typically featuring darker dorsal surfaces with lighter flanks. They inhabit cold, clear rivers and lakes, often in large rivers and floodplains. Juveniles occupy shallower, slower waters and feed on invertebrates, while adults become apex predators, feeding on fish, amphibians, waterfowl, and occasionally small mammals.

Life history and behavior include late maturation and long lifespans, with ages reaching several decades. Taimen migrate upstream to spawn, typically in autumn, in gravelly or rocky sections of large rivers. Spawning produces a substantial number of eggs, and juveniles recruit into the riverine environment, where growth can be slow.

Conservation status and threats are significant. Overfishing, bycatch, habitat degradation, dam construction, and climate change have impacted populations. The IUCN Red List lists Hucho taimen as Endangered. Conservation measures in various parts of its range include fishing restrictions, catch-and-release policies, and habitat restoration to protect critical spawning and rearing areas.