Why do salmon swim upstream when spawning? Detailed answer

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Why do salmon swim upstream when spawning? Detailed answer

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Why do salmon swim upstream when spawning?

Many animals, from our point of view, give birth and protect their young in a very strange way. After all, isn't it amazing how birds build nests, or how some animals are willing to fight to protect their offspring from enemies?

The instinct that drives a salmon to make the long journey upstream is that this is the best way to have young and raise them safely. Not all members of the salmon family go far upstream to spawn. Some remain below. For example, pink salmon. It spawns just a few kilometers from salty sea water. In contrast, king salmon can swim about 5 kilometers from the sea up the river.

Fresh water is the most favorable conditions for salmon, where it becomes healthy, strong and fat. But once in fresh water, he stops eating. Sometimes salmon get completely exhausted trying to reach the place where they want to lay their eggs.

Since many of the rivers they swim in have rapids, waterfalls, and rocks, salmon often become thin and look very ill by the time they start to spawn. But regardless of whether he is exhausted or in great shape, the Pacific salmon stubbornly moves towards the spawning ground.

When the fish reaches the place (usually the same place where she herself was born), the female digs a hole in the pebbles or sand, using her body, tail and fins. Then she throws eggs into this "nest", and the male fertilizes her. After that, the female burrows her eggs.

When the work is done, salmon lose all interest in life. They drift downstream and soon die. Now the life of newborn fish begins, which are born after about 60 days.

Young salmon stay in fresh water for several months or a year, and then move downstream to the sea. And the life cycle starts again.

Author: Likum A.

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