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Salmon Life Cycle

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Brittany Wiggins

on 10 November 2013

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Transcript of Salmon Life Cycle

Salmon Life Cycle
The salmon is one of a few species of fish that will spend its life in both salt and fresh water.
Stage One
The female salmon digs a nest in the gravel of a freshwater stream.
After a mate is selected, the female lays her eggs.
The male salmon then fertilizes the eggs externally.
The eggs remain hidden in the gravel until the spring then they hatch.
Stage Two
The eggs eventually form tiny salmon.
The tiny salmon, called alevins, stay in the gravel and absorb their yolk sac.
Then, they leave their gravel home.
Stage Three
The young salmon emerge from the gravel and are now called fry.
The salmon continue to grow and eat insects.
Some salmon species live in the rivers for 1 to 2 years before heading to the ocean. Other salmon begin their journey as soon as they leave their nest.
Stage Four
When the young salmon reach the estuary, or brackish water, they undergo many physical changes needed to live in saltwater.
The salmon spend two to five years in the saltwater ocean .
In the ocean, the salmon continue to mature by gaining weight and continually migrating.
Stage Fiive
The mature adults, that are ready to breed, begin returning to the same freshwater stream they hatched from facing many challenges as they swim upstream.
The salmon change colors from silver fish to dark or brightly colored adults who are ready to spawn.
After spawning (breeding), most salmon die and return vital nutrients to the hatching stream.
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