As the Atlantic warms, many fish along the east coast of North America have moved northwards to keep within their preferred temperature range. Black sea bass, for instance, have shifted hundreds of miles up the coast.
In the Mediterranean, the picture is very different. Without an easy escape route towards the poles, many species are effectively trapped in a sea that is warming rapidly. Some native fish are even being replaced by more heat-tolerant species that have slipped in through the Suez Canal.
