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AN EPIZOOTIC OF WATERFOWL ASSOCIATED WITH A RED TIDE EPISODE IN FLORIDA 1

During February and March, 1974, an epizootic involving lesser scaup (Aythya affinis) occurred in the Tampa Bay area on the west coast of Florida. Several thousand ducks are estimated to have died. Concurrent with this epizootic was a red tide caused by heavy blooms of the toxic dinoflagellate Gymnodinium breve which caused severe wide-spread fish kills. Clinical signs consistent with G. breve intoxication were evident in some of the lesser scaup. A controlled experimental feeding of G. breve toxic material to White Pekin ducklings produced illness and death with signs comparable to some of those seen in the scaup.