Development of Salmo salar, from egg to alevin You can easily see the developing eye and neural tube here. An “alevin” is the initially hatched fish, when it’s still living off its yolk sac. The Atlantic Salmon’s eggs incubate at different rates, depending on the temperature of the water. Assuming water at least 6-8 C, the incubation is 35-45 days to “eyed” (when the eyes are visible within the egg), 18-20 days from eyed to hatched alevins, and 14-21 days until the alevin has used up its yolk sac and is a free-feeding fry (juvenile fish). In total, it’s about 68-86 days in total from being laid to becoming true fry. La Monde de la Mer. Alfred Fredol, 1866.

Development of Salmo salar, from egg to alevin

You can easily see the developing eye and neural tube here. An “alevin” is the initially hatched fish, when it’s still living off its yolk sac.

The Atlantic Salmon’s eggs incubate at different rates, depending on the temperature of the water. Assuming water at least 6-8 C, the incubation is 35-45 days to “eyed” (when the eyes are visible within the egg), 18-20 days from eyed to hatched alevins, and 14-21 days until the alevin has used up its yolk sac and is a free-feeding fry (juvenile fish). In total, it’s about 68-86 days in total from being laid to becoming true fry.

La Monde de la Mer. Alfred Fredol, 1866.

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