A new study has found bottom-dwelling fish — including flounder, halibut, rockfish, and all five Pacific salmon species — are defying expectations in the face of heat waves.
An analysis of almost 250 marine heat waves has found the impacts on bottom-dwelling fish were “often minimal” and found no evidence extreme heat events had driven colder water fish toward the poles.
But the latest study, found fish dwelling closer to the sea bottom — including flounder, halibut, rockfish and all five species of Pacific salmon — were surprisingly resilient to rising temperatures. William Cheung, director of UBC’s Ocean Sustainability and Global Change Institute and another co-author on the study, said the results were surprising, and showed the impacts of heat waves on fish could be both more complex and more “sporadic” than once thought.He pointed to a powerful marine heat wave known as “The Blob” which between 2014 to 2016 led to a 22 per cent loss in biomass off the coast of B.C. and Alaska.
At the same time, Palacios-Abrantes said it could be that a lot of previous studies looking at the impacts of marine heat waves focused on the extremes. Taken together, the ability of the bottom fish to get through a variety of heat waves unscathed as populations shows “there is some light of hope,” he said.
France Dernières Nouvelles, France Actualités
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