A newly spawned salmon or trout still carrying the yolk.
- The newly hatched salmon, called ‘alevins,’ remain in rapid water until they are about 65 mm long.
- In mid spring, after the larval fish has absorbed its yolk sac, it emerges as an alevin and proceeds to find suitable habitat for the summer period.
- After 90-150 days (depending on temperature) the eggs hatch, and the alevins (fry with yolksacs attached to the underside) stay in the gravel until the yolksac is used up.
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