An unusual colour morph of a probable Holacanthus ciliaris was observed in Dry Tortugas, Florida, which can possibly be explained by recessive homozygosity, however, further testing is necessary. This variation of H. ciliaris has previously only been described at St Paul's Rocks, Mid-Atlantic Ridge. (C) 2009 The Authors Journal compilation (C) 2009 The Fisheries Society of the British Isles741024152421NOAA Fisheries Coral Reef Program [NA17RJ1226]NPS Cooperative Ecosystems Study Unit [H500000B494-J5299051011]NOAA General Coral Reef Conservation Program [NA05NMF4631044]NOAA Biogeography Program [NA17RJ1226]Florida Fish and Wildlife Conservation CommissionNOAA Fisheries Coral Reef Program [NA17RJ1226]NPS Cooperative Ecosystems Study Unit [H500000B494-J5299051011]NOAA General Coral Reef Conservation Program [NA05NMF4631044]NOAA Biogeography Program [NA17RJ1226]