Salmon's mystery about swimming round (Salmon)

Salmon is a well-known fish, they lay eggs in fresh water, with children only live for a short time in the river and swim to the sea to live. When they grow up, return to the old river to lay eggs. Those who have seen salmon jumping up and down the river to return to their homeland all admire the courage and instinct of salmon.

Adult salmon returns to the old river to spawn (Photo: frontrangeanglers) Wide sea, so long river, so many rivers, how salmon can recognize your old river, from the sea immense in the way to the old country? This is really a mystery. Only recently have biologists applied scientific methods to research and find answers.

Some scientists theorize the taste. American biologist Hasler, when he was young, he used to go back to his hometown, often take a walk on the crowded street smelled of grass and moss. Now every time he smells that he remembers his childhood. This reminds him of the spinning of salmon. He began to study in the direction of taste.

Experiencing more than 20 years of experimentation, found that every river has its own taste, this flavor is strongly impressive for young salmon. When they grow up, they follow the old trail of taste that leads them back to their birthplace.

But out in the ocean, what are they oriented, to return to the familiar taste? This is still a puzzle that has not been solved yet.