A new breakthrough points to toxins, yet the mystery of what sparked this bizarre phenomenon continues to puzzle experts.
Goliath groupers, which can live up to 50 years, are one of the species observed spinning in odd circles in the Florida Keys.After tireless months of data collection and testing, scientists have likely pinpointed the cause of the spinning and dying fish in Florida: toxic algae.—including the critically endangered smalltooth sawfish—whirling in circles, usually until they died.
After testing hundreds of water and fish samples, the experts concluded the symptomatic fish died from combined exposure to multiple toxins, possibly originating from multiple species of dinoflagellates, a type of microscopic algae.Under normal conditions, the dinoflagellates in question live on seagrass and larger algae on the seafloor, rather than free-floating in the water column.
Robertson and her team didn’t find many toxins in the muscles of symptomatic fish, but their livers—the organ responsible for filtering out impurities—were chock-full of toxins, ranging from ciguatera to a variety of other dinoflagellates.
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