The broad whitefish (Coregonus nasus) is a lake and river fish of the genus Coregonus. The body is large, the head small, the mouth lower, the maxilla short and broad. Lateral line scales 85-106, gill stamens 19-25. The largest whitefish, reaching a weight of 16 kg. It is found in the rivers and lakes of northern Russia (European part, Siberia and Kamchatka) and the northern provinces of Canada. It can live in semi-fresh water in the bays of the Arctic Ocean. Spawns in autumn, in October-November. Spawning is not annual. Matures in the sixth to seventh year of life. Fecundity from 13 to 135 thousand eggs. Eggs are pale yellow, large, up to 4.0-4.2 mm in diameter. Diet consists mainly of benthic invertebrates. Bentophagous, feeding on chironomid larvae, molluscs, crustaceans. It is a valuable fish. It is a promising object for aquaculture.

The body of the broad whitefish is broad, compressed at the sides. The nose is thick, humped and protruding behind the lower jaw; the mouth is small. The colouring of the sides is silver with a golden tinge, the back is dark, with large and dense scales. Life expectancy is up to 26 years.