When do the salmon’s eggs hatch?

The incubation time depends upon the water temperature. Hatching usually occurs in early spring and the young fish (called “alevins”) remain in the redd for a few weeks., nourished by the attached yolk sac. When they emerge from the gravel in April or May, they are about one inch in length. As they grow, the young fish develop prominent markings on their sides and are then known as parr.