SIZE :
From 16 to 25 cm, up to 45 cm.
LIFE EXPECTANCY :
Up to 6 years.
LIFE CYCLE :
Sexual maturity at 2 years of age.
Spawning takes place in fresh water, below the ice, from mid-December to the end of January. The female lays between 6,000 and 65,000 eggs at the foot of rapids, on a sand or gravel bottom. The eggs hatch one to two months later, depending on the temperature. The fry settle in the brackish waters of the rivers for a few months, before joining the adults in open sea.