Some of the most common fish species are surgeonfish, parrotfish, reefperch and wrasses. The striated surgeonfish is one of the few herbivorous fishes which are occasionally toxic. Its common names are powder blue tang and powder-blue surgeonfish. Many species are aggressive towards other fishes which also graze on algae, such as surgeonfish. They often swim in schools with other species such as the Atlantic blue tang surgeonfish. The yellowfin surgeonfish ranges in length to . These aggregations may also include other species such as the sleek unicorn surgeonfish, Naso hexacanthus. Yellow tang are in the surgeonfish family. Acanthurus lineatus, the lined surgeonfish, is a member of the family Acanthuridae, the surgeonfishes. Blue tang is the common name of several species of surgeonfish. Acanthurus coeruleus is a surgeonfish found commonly in the Atlantic Ocean. The striated surgeonfish, "Ctenochaetus striatus", is a species of marine fish in the family Acanthuridae. Naso is a genus of fish in the surgeonfish family, Acanthuridae. Hunting, they lie on the bottom and surge forward, preferring juvenile surgeonfish and crustaceans. Subsequent studies illustrated the relationship between these symbionts and the host surgeonfish.