A chemical signature recorded on otoliths (ear bones) of Chinook salmon could tell scientists where the fish lived, says a new study published in the journal Science Advances. Chinook salmon (Oncorhynchus tshawytscha). Image credit: Zureks / CC BY-SA 3.0. “Each fish has this little recorder, and we can reveal the whole life history of the fish from the perspective of the otolith,” explained Dr Sean Brennan of the University of Washington, who...
