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The image illustrates the life cycle of a salmon starting with eggs in fresh water, hatching in about 3 months, progressing to the alevin stage where they feed off a yolk sac for several weeks, transitioning to the fry stage at 5 to 10 weeks old and swimming, then becoming parr at several months old with "finger" markings, evolving into smolt at 1 to 3 years old, which will group and head out to sea, transforming into adults spending 1 to 6 years at sea, culminating as spawning adults that spawn and die within 2 weeks, completing the cycle back to eggs in fresh water.
Given the complexity of the image, the above description may not be entirely accurate.
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The picture illustrates the lifecycle of the spawning fish.
Overall, the organism undergoes several development stages before reproducing and completing its life. Of particular note is that fish migrates between freshwater and sea as it matures.
Initially, the adult fish lay caviar in freshwater, which takes approximately three months to hatch. The newly hatched fish, known as alevin, feeds on its yolk sac for several weeks. After five to ten weeks they develop into fry and are able to swim. Several months later, they reach the parr stage in which finger markings appear on their body.
Therefore, the fish become smolt at the age of one to three years. At this point, they form a group and migrate to sea. They spend between one to six years at sea during adulthood. Followed by returning to fresh water in order to generate a new generation, at this stage fish lay eggs and die within two weeks.
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