In a new study carried out by the scientist over the population of Chinook salmon has revealed that it’s possible to learn the possible location of the fish where it has spent substantial portion of its life by examining its ear bone. Scientists believe that the ear bone has the capability to retain the traces of the chemical composition of the water that the fish resides in similar to the rings on the trees.
The ear bone called “otolith” is affected by the chemicals in the water where the fish was first hatched in and later spent their later years. This chemical trace can be analyzed by the scientists to determine the place and are where the fish was birthed in.
The bone attracts the ions in the water, which are deposited due to the chemical composition of different metals that are present in the water source. The tests show that this method can be reliably used in order to track the movement of the fish’s population.
The study further revealed that each river has a separate chemical composition much similar to the finger prints of humans that gives them separate identity and make it easier for the scientists to trace the location of the fish. The tests can be further enhanced by collecting the data about the chemical composition of different rivers in the region.
The Alaskan region contains the largest population of the Chinook salmon, which migrate to Pacific Ocean after reaching maturity.