It is too soon to speculate the cause of the unusual behavior, researchers say.
Researchers examine a dead sawfish that was found in the Florida Keys.Scientists are puzzled over what's causing hundreds of fish to wash up dead in South Florida, including an endangered species native to the region.Florida Fish and Wildlife CommissionBut there are no signs of a communicable pathogen, the commission published in an update on Wednesday, based on fish necropsy data.
Dissolved oxygen, salinity, pH and temperature are not suspected to be the cause of the fish behavior or kills, according to the FWC. Red tide toxins have not been detected in water samples either. MORE: Number of sea turtle nests on Florida coasts exploding, even tripling in some regions, conservationists say
While researchers have several theories on what could be causing the unusual fish behavior, it is too soon to speculate, Brame added.Researchers examine a dead sawfish that was found in the Florida Keys.Dozens of carcasses of smalltooth sawfish have been among the piles of dead fish, according to the FWC.
It is unclear how many smalltooth sawfish are left in the wild, Brame said. They historically ranged from North Carolina to Texas, but they are now only found regularly in South Florida.
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