Most Atlantic salmon follow an life cycle. Once hatched, they are called alevins. They live off the nutrients in their yolk sac they were born with. Once they start feeding they are called fry. They grow into juveniles or parr and remain in fresh water for a number of years while growing. When they leave fresh water they are called smolts. Smolts leave the streams and move into the ocean for feeding and growth. The post-smolts change from territorial behavior to that of open ocean, possibly shoaling, fish. Their mortality rate while in the ocean is very high. The rate is from 90% to as high as 99%. After 1–5 years at sea they return to spawn in the same streams they were born in. Unlike most Pacific varieties Atlantic salmon are meaning they don't automatically die after their first spawning. But the stress of spawning, predators, or disease does kill many. The remainder return to sea to spawn again and again.