SIZE : From 15 cm to 32 cm, up to 55 cm.
LIFE EXPECTANCY : From 3 to 5 years; record of 15 years.
LIFE CYCLE : Sexual maturity around 2 or 3 years.
Spawning takes place between late summer and autumn, when temperatures drop below 10 ° C.
The number of eggs laid by a female depends on its weight. They are laid on a gravel bed that is well oxygenated by the current. The male fertilizes the eggs immediately, and the female covers them. The eggs will develop over winter. They hatch after 50 to 100 days, depending on the water temperature.