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Mediterranean marine heatwaves threaten coastal livelihoodsKERKENNAH ISLANDS...A decade ago, Tunisian fisherman Ahmed Chelli's nets bulged with fish and octopus that he sold at the local market in the Kerkennah islands. Today, he pulls up only "ISIS" — the name locals have given to the blue crabs that have invaded their fishing grounds in the fast-warming waters of the Mediterranean. For more than 70 days this summer, a marine heatwave cooked the waters of the western Mediterranean. It was the worst swelter for the western part of the basin in the last four decades, said marine ecologist Joaquim Garrabou at Spain's Institute of Marine Sciences, who monitors temperature gauges in the sea's near-coastal waters.