Climate change takes habitat from big fish, the ocean's key predators

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This year’s marine heat waves and spiking ocean temperatures foretell big changes in the future for some of the largest fish in the sea, such as sharks, tunas and swordfish.

are especially dangerous for these fish because warming makes their open-water habitats less suitable, scientists who study the species said. Loss of habitat could largely remove some of the most important predators — and some of the most commercially important seafood species — from the ocean.in Massachusetts, predicts that some large species could lose 70% of their habitat by 2100.

The heating of the world's oceans is a longstanding focus of climate scientists, and warming has accelerated this year. Earlier this year, the global average ocean sea surface temperature jumped two-tenths of a degree Celsius in a period of a few weeks, surprising even scientists who have grown accustomed to surging temperatures.in recorded history in July.

The U.S. catch of swordfish was worth about $23 million at the docks in 2022 and many millions more at supermarkets, restaurants and seafood counters. Albacore tuna fetched more than $36 million at the docks. The impact of warming waters on fish is complex, and the subject of much scientific research. A studyin August found marine heat waves “are not a dominant driver of change” in some species that live near the ocean bottom. The study shows that negative impacts of marine heat waves can be unpredictable, its authors said.

 

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