The grand journey at sea.
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The salmon that reach the ocean seek an abundant food supply, such as sardines, and swim around the ocean in schools.
Then, after four years of traveling, they return to the river in which they were born.
*Returning salmon are usually from 2 to 5 years old. Most of them are 4 years old.
Now then, how do salmon find their way back to the river after such a long journey? There are many theories: that they use the sun to guide them; that they ride the ocean tides; that they smell their way home. But the truth is yet a mystery.