Trout follow their noses

"If I was a fisherman I probably wouldn't invest a large amount of money in a big magnet" Dr Carol Diebel

Researchers in New Zealand say they have discovered crystals in the noses of rainbow trout that act as direction finders for the fish.

"We're not saying that rainbow trout are necessarily attracted to magnetic fields, we're just saying that they can use it. So if I was a fisherman, I probably wouldn't invest a large amount of money in a big magnet."