hucho

Hucho is a genus of large freshwater fish in the family Salmonidae, within the subfamily Salmoninae. The genus has included several big, predatory species native to the Palearctic region. The best known member is the Danube huchen, Hucho hucho, commonly called the Danube salmon, which historically inhabited large rivers in western and central Europe. Modern classifications sometimes place other closely related forms in separate genera (for example, Parahucho for some taimen populations), reflecting ongoing revisions in salmonid taxonomy based on morphological and molecular data.

Species within the genus are generally characterized by elongated bodies, a large mouth with sharp teeth, and a coloration that ranges from olive to brown with varying dark markings. They are among the largest freshwater fishes in their ranges, and individuals can reach substantial lengths under favorable conditions. Hucho species are typically top predators in their ecosystems and exhibit migratory or semi‑m migratory life histories in which adults move between rivers and, in some regions, larger connected water bodies to spawn.

Habitat and ecology vary by species, but many Hucho inhabit clear, cool, well-oxygenated rivers and streams, often with fast-flowing sections and gravel or rocky substrates suitable for spawning. Reproduction involves spawning in gravel beds, with juveniles remaining in freshwater habitats for multiple years before reaching full size.

Conservation concerns for Hucho include habitat alteration, dam construction, water extraction, pollution, and overfishing. Many populations have declined, and several species are subject to protective measures or restocking restrictions. The genus remains of interest for biodiversity, freshwater conservation, and sport fishing in parts of its range.