World Bulletin / News Desk
Salmon have for a long time been a subject of study by scientists who have struggled to understand how these fish are able to swim halfway around the world only to return to the exact same place they were born in order to reproduce.
A new study by US researchers which was published in the Current Biology journal has suggested that salmon actually use an in-built "magnetic map" of the Earth's magnetic field to navigate across thousands of kilometres.
Oregon State University's Dr Nathan Putman said: "The migration is a lot of effort and it is definitely challenging, and looking at it from the outside, it doesn't seem necessarily intuitive how they could manage that."
The discovery was made after researchers put the salmon in buckets of water and then changed the magnetic field around them. In doing so, the fish changes direction in which they were swimming in response to the field.
Dr Putman explained: "It's like they have a map. They know something about where they are based on what field they are in."
The fact that the fish that were studied had never before made a migration, scientists think this magnetic sense is something salmon are born with rather than a skill that is learned through observation.Last Mod: 10 Şubat 2014, 11:59