Spawns in spring and summer. In most populations, most adults are 1-2 years old, do not live beyond 4 years, and presumably die at the end of their first breeding season. Reimchen (1992) described a population in Drizzle Lake, Queen Charlotte Islands, British Columbia, in which individuals lived up to 8 years. Male guards eggs and fry. Eggs hatch in about a week. Nest may contain eggs of several females.