fish....oh are you gonna have fish....you gotta have angel fish. Arguably the most beautiful fish in the sea, the regal angelfish presents a tremendous temptation to marine aquarists, but it has proven difficult to maintain in captivity. Armed with a better understanding of its natural habitat and the peculiarities of its behavior, your chances of successfully maintaining this species will improve.
The regal angelfish occurs throughout the northern and western Indian Ocean, the Red Sea and the Indo-Pacific Ocean. Adult regals can be found roaming shallow coastal to deep outer reefs in areas of rich coral growth. They are often observed as solitary individuals, but can be encountered in pairs or even in small groups. The maximum adult size is reported to be between 8 and 12 inches (20 and 30 centimters).
Juveniles tend to be more secretive than adults and are often observed in the vicinity of caves. Their coloration is somewhat muted compared to the adults and the vertical stripes on juvenile regals are fewer and farther apart. Juveniles also possess a large false eyespot at the base of their dorsal fin that fades as the fish matures. The regal angelfish loses its juvenile coloration at a much smaller size as compared to other large angels in the family Pomacanthidae. Regal angels usually have their full adult coloration at a size of just 2 to 2 3/4 inches (6 to 7 centimeters).
Regal angels are not sexually dichromatic, but color differences do exist between specimens that occur in the Red Sea/Indian Ocean versus those originating from the Indo-Pacific area. Red Sea/Indian Ocean specimens have a rich golden-orange coloration throughout the ventral area, while those from the Indo-Pacific are colored a dull blue-gray in this region.
There is much speculation as to why regal ngelfish and many other marine tropical fish, possess such gaudy coloration. Territorial species, such as marine angelfish, are specialized feeders and food in a given area of a reef can be limited. One theory is that the conspicuous coloration serves as a signal to con-specifics to “keep out.” Other species of fish are tolerated, however, because they don’t represent a threat to the food supply. In the case of the regal angelfish, their foods of choice are sponges and tunicates, which make up the bulk of their diets.