I think you are referring to otiliths, also known as ear bones? I use to cut them out of redfish and sheepshead when I was working for FL fish and wildlife, they would use them to age the fish. Pretty cool things, looks like they could make good jewelry.
http://www.abc.net.au/rn/scienceshow/stories/2007/2119488.htm
A little paragraph talking about other ways biologists use them for fish research.




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