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

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.

For large species of fish, the protracted warming can be disruptive because of their own thermal preferences, said Janet Duffy-Anderson, chief scientific officer of the Gulf of Maine Research Institute in Portland, Maine. Large fish are often highly migratory, and increased warming could result in the species moving to northern or deeper waters in search of more ideal temperatures, she said.“I think what we’ll see is a shift in their distribution,” Duffy-Anderson said.

Changes in distribution of large fish could necessitate major adaptations in the way fishing industries are regulated, said Braun, an assistant scientist at Woods Hole. The coming warming is “likely to have substantial socioeconomic impacts on fishing fleets that target” these fish, especially in the southeastern U.S., home of lucrative fisheries for species such as bluefin tuna and swordfish, his study said.

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