For 8 months, South Australia has been besieged by mysterious toxic algae. Dead rays, octopuses, crabs, and other marine species, some shrouded in grayish foam, litter tens of kilometers of shoreline. “There’s a very strange feeling when you’re on the beach,” says marine biologist Shauna Murray of the University of Technology Sydney. “It’s just eerie.” Besides sickening people, the toxins have caused large economic losses in fisheries, aquaculture, and tourism.


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