Stones inside fish ears mark time like tree rings – and now they're helping us learn about climate change

By Clive Trueman, Professor of Marine Biology, University of Southampton

As a marine biologist, I’ve always found it fascinating to learn about how animals adapt to their habitat. But climate change has made it more important than ever – wild animals’ futures may depend on how much we understand about them.

Fish have a kind of stone in their ear that scientists can read like tree rings. My team’s new research found a way to decode the chemicals in these stones to measure how much energy they used when alive. What we learned could help bluefin tuna survive the climate crisis.

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