They should not be confused with the freshwater angelfish, tropical cichlids of the Amazon Basin. The flame angelfish is often considered reef safe. Marine angelfish are perciform fish of the family Pomacanthidae. "Pterophyllum" should not be confused with marine angelfish, perciform fish found on shallow ocean reefs. The emperor angelfish is omnivorous, feeding on both small invertebrates and plants. Leopards and ladybirds are spotted; angelfish and zebras are striped. This is the species of angelfish most frequently found in the aquarium trade. In pet stores, the freshwater angelfish is typically placed in the semiaggressive category. The emperor angelfish ("Pomacanthus imperator") is a species of marine angelfish. French angelfish ("Pomacanthus paru"), and giant barrel sponges. Naturally occurring angelfish are frequently striped transversely, colouration which provides additional camouflage. The freshwater angelfish ("P. scalare") was described in 1824 by F. Schultze. In 1901 an angelfish fishery was established. The masked angelfish ("Genicanthus personatus"), endemic to the Hawaiian Islands, is relatively common there. The body of the Regal Angelfish is moderately elongate and is very compressed.