Salmon that spend their adolescence in the ocean swim to the estuary in droves when they are sexually mature, swim upstream at a speed of 40 to 50 kilometers day and night, and lay eggs in the upper reaches of rivers hundreds of kilometers away from the ocean.

During the migration, they don't want to eat or drink, just look forward, and they don't flinch when they encounter shallow canyons and rapids.

Sometimes in order to jump over obstacles, I hit a stone wall and died. After arriving at the destination, due to the long journey, my body fat was exhausted and I looked haggard.

Most salmon die after ejaculation and spawning, so they can't take care of their offspring. After the fertilized egg develops into a small fish in the river, it goes down the river, returns to the sea after four or five years, and then returns to the upper reaches of the river to lay eggs along the route passed by parents.