It seems that SALMONs have a habit of returning to the river where they were born and spawning. In the case of salmon from the Tone River basin, juvenile fish descend the river to the Pacific Ocean and migrate to the Sea of Okhotsk and the Bering Sea in the North Sea. Will it be four years at the earliest to return to Japan? They can travel 4,000 to 7,000 kilometers, but only 3-4% can return, making them a living legend. The growth pattern and basic growth rate of salmon juvenile fish can be seen simply as the ratio of the first value to the difference between the two values over a period of time.

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