Scientists don't know why salmons migrate but it's fascinating s

story. Salmon has very sensitive nose. Along as the water they are in has one little drop of water from their birthplace, they can follow the trace back to their birthplace. That's why pollution can put salmon in danger.

The longer salmon stay in fresh water, the more their meat deteorates and the less tasteful they are.

Atlantic salmon (even though they are called salmon) are not true salmon and they are actually one type of trout. Atlantic salmon can also migrate and spawn multiple times in their lifetime.