The university is working with the FWC, the Florida Department of Environmental Protection and other agencies to determine the source of the unusual behavior. Dissolved oxygen, salinity, pH and temperature are not suspected to be the cause of the fish behavior or kills, according to the FWC.... Researchers are essentially approaching the tests as a" needle in a haystack," he said." This is unusual," Parsons said.... Health officials are warning residents to not eat any spinning fish or fish ca