Once the eggs are hatched, the fry take in nutrition from the egg yolk.
Coming out from the sand and pebbles, the fry head toward the ocean with all their little might.
Just after fertilization, the eggs are so fragile that the slightest tremor will cause death. Once the eyes are developed inside the eggs, they become more resistant to tremors and shocks, but during the time the little ones feed on the yolk of the eggs, they again become very sensitive to sunlight and changes in water temperature and current speed.
In artificial incubation and release, the utmost care must be given to all behavioral patterns of salmon - from the time of their capture to the time of their release - in order to assure the successful growth of the fry.