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Emperor AngelfishImperator Angelfish, Imperial AngelfishFamily: Pomacanthidae Pomacanthus imperatorPhoto © Animal-World: Courtesy David BroughLatest Reader Comment - See More I noticed a lot of people have posted that they have had their emperor angel for years and have had no signs of color change. I bought mine about a year ago as a... (more) Dustin Harders The handsome Emperor Angelfish is the best known of all the saltwater angelfish!Emperor Angelfish Contents The exotic Emperor Angelfish Pomacanthus imperator, also called the Imperator Angelfish or Imperial Angelfish, is one of the most recognized angelfish in the sea. It is unusually beautiful both as a juvenile and as an adult. Adults are truly regal, being deep bodied and slightly elongated with yellow and royal blue horizontal lines streaming across their frame. The pretty juveniles are black with light blue and white curved stripes and a honeycomb pattern on the top and bottom fin and tail made up of black spots edged in blue. In the aquarium the Imperator Angelfish are semi-aggressive, though they can be a good community fish with the proper tank mates, especially when young. Tank mates like cardinalfish, other large angelfish, clownfish, and small peaceful fish will more than likely be harassed by an adult Imperial Angelfish. Adding the Imperator Angelfish last is the best choice due to their territorial behavior. Make sure the tank is at least 6 months old, and has plenty of live rock for it to graze on. Several hiding areas will help it feels secure, so shape rocks into cave type formations as places of refuge and comfort. The best sized Emperor Angelfish to obtain for adjusting to life in a captive environment is a juvenile 4" to 6" (10 -14 cm) in length. Make sure they are very curious and active in their environment. The size of these angels when they start to change color is from 3" to 5" (8 - 12 cm). The Imperator Angelfish will generally reach 12" (30 cm) in the aquarium. A large tank of at least 225 to 275 gallons (852 to 1041 l) is needed for a well developed and unstressed large Angelfish. In a reef tank the Imperator Angelfish will nip large polyp stony corals (LPS), anemones, zoanthids, clams and some soft corals. If you have a large tank with small polyp stony corals (SPS) and/or some noxious soft corals and the angel is well fed, they may leave them alone. Yet each Angelfish has its own idea of what "dinner" may be, and some may still pick at them. Above is the adult coloration of the Emperor Angelfish . The juvenile is blue with white stripes, and looks similar to the Koran angelfish. (See the picture of the Koran angelfish) For more Information on keeping saltwater fish see: |
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Habitat: Natural geographic location The Emperor Angelfish Pomacanthus imperator, is also known as the Imperator Angelfish and Imperial Angelfish. It is from the Pomacanthidae family, and was first described by Bloch in 1787. It is found in the Indo Pacific Ocean from the Red Sea and East Africa to the Hawaiian, Line and Tuamoto Islands. They can then be found from Southern Japan then south to the Great Barrier Reef, New Caledonia and Austral Islands. They are absent from the Easter Island, Rapa and Marquesan Islands.
Juveniles inhabit areas under ledges or in holes of semi-protected channels, outer reef flats and outer lagoon patch reefs. The juvenile and sub-adult Emperor Angelfish have been seen cleaning larger fish in the wild. Subadults can be found in reef front holes and in surge channels. Adults are found under ledges and caves where there is plentiful coral, in seaward reefs, channels or clear lagoons.
Adults Imperial Angelfish like to pair up, unlike some of the other Pomacanthus. They are found at depths from 3 to 328 feet (1 to 100 m). Sponges, encrusting organisms and tunicates are their main food. As of yet, breeding in captivity is not possible and tank raising these angels has not been successful.
Status The Pomacanthus imperator is on the IUCN Red List as Least Concern (LC), with a stable population
Description The adult Emperor Angelfish or Imperator Angelfish are deep bodied and slightly elongated. They have yellow and blue horizontal lines throughout their body that start from just behind the gills to the area just before the tail fin which is yellow. Starting at the top of the dorsal fin to the anal fin, it is blue and can have some blue striping. The dorsal fin is trimmed in white. WMA_Ap19AA_med.jpg)
Emperor Angelfish - juvenile Photo © Animal-World
The mouth and snout area are white, which is sharply cut off by a black mask that covers the eyes. The mask is black, trimmed in blue. There is a yellow vertical bar that extends from the yellow in the head downward. It divides the black mask from a thicker vertical black band that starts about 1/4 of the way down the body and continues down into the pelvic fins. This black band is in the same area of vertical space as the pectoral fins and gills.
Juvenile Emperor Angelfish are black with vertical lines in light blue and white on the face. Behind the gill area are 3 thicker white bands. The first is a curved band that starts from the dorsal fin to the anal fin, the second forms a "C" shape, and the third forms a white circle near the tail fin. In between these white bands are thinner light blue bands. The dorsal and anal fins have a honeycomb patterning that is black in the center and trimmed in light blue. The top dorsal fin has a white top edge.
WMA_Ap19AA_med.jpg)
Emperor Angelfish - sub adult Photo © Animal-World
Sub-adult looks like the juvenile Emperor, except the tail fin starts to develop yellow in the patterning. Yellow vertical dashes start to appear on the body, blending into the juvenile pattern. The sub adult also becomes more deep bodied and rounder, like the adult.
Don't confuse the Emperor Angelfish with the very similar looking juvenile Koran (Semicircle) Angelfish Pomacanthus semicirculatus. On a Koran juvenile, the very last white stripe makes a crude "C" shape that at times can form a circle. But the Imperator juvenile has a full circle within the "C" shape. The Imperator juvenile also has irregular light blue lined circles in the dorsal and anal fin, where the Koran does not.
Length/Diameter of fish The Imperator Angelfish are deep bodied and can grow up to 15.7" (40 cm) in the wild, yet in captivity, they will generally only reach about 12" (30 cm).
Difficulty of Care The Emperor Angelfish or Imperator Angelfish are considered moderately hard to advanced in difficulty because of the excellent water quality that is needed, along with a large tank to properly house this fish. If a tank of 225 gallons or more with numerous caves can be provided, this can lower stress levels.
When obtaining your Emperor Angelfish, the best size for adjusting to life in a captive environment is 4" to 6" (10-14 cm) in length. Make sure they are very curious and active in their environment. Also, find out where the fish you are considering is from. Fish from the Indo-Pacific may not do well due to poor capturing practices from that area. Especially those from the Philippines and Indonesia.
If an Emperor Angelfish is disoriented and excessively bright, that can be a sign that they are victims of cyanide and will die. Also, a gill count of over 80 a minute as they calmly swim around is a red flag. It is very important to have the LFS direct the fish into a container or bag to capture it, since nets can get snagged on their gill cover spines, causing injury which can lead to possible infection and subsequent death.
Foods and Feeding Emperor Angelfish are omnivores, in the wild they eat a wide variety of sponges and encrusting organisms along with small amounts of algae, tunicates, hydroids, and bryozoans. It is important that you feed angelfish all kinds of live, frozen, and prepared formula foods. Feed vegetable based foods as well as meaty foods like chopped squid, scallop, and shrimp. Prepared foods with marine sponge and tunicates are essential. Foods containing color enhancing qualities may be used as well. A good formula that can be made at home consists of mussels, shrimp, squid, and spinach. Feed 2 to 3 times a day in smaller amounts to keep water quality good.
Aquarium Care In general, Pomacanthus angelfish are not as forgiving as many other fish when it comes to water quality. Water quality must be high for the Imperial Angelfish to prevent illness, which can lead to death. Water changes of 30% a month, or 15% every 2 weeks is optimal in keeping nitrates lower. If there are corals in the tank, then 20% every month, 10% every 2 weeks or 5% a week works great.
A large tank is important for this large fish. Because it needs a lot of food, there is a large bio-load on the aquarium and a smaller tank will foul quickly. A suggested guideline is to keep up with your water testing, which will tell you when your tank needs a water change.
Aquarium Parameters
These angels, like others, need a stable environment which is at least 6 months old. It is best to introduce it last as a young fish into an established tank, minimum size of 225 gallons will be needed for an adult. Imperial Angelfish, like others angels, enjoy large amounts of rock work to graze on and to hide in, so arrange them in a way that your angel can "hide" when needed.
- Minimum Tank Size / Length: A minimum size of at least 225 to 275 gallons (852 to 1041 l) is needed for an adult, 125 gallons (473 liters) for a juvenile.
- Marine Lighting: Any. While seen as brightly colored fish in books and online, it has been stated that they may end up in a more faded version if a juvenile coloration is acquired and raised in captivity. It is possible that this is due to the lack of lighting in a fish only tank. It may be that providing reef lighting as you would for corals, may help. A decent amount of lighting has also been observed to help other Pomacanthus from developing HLLE (Head and Lateral Line Erosion Disease).
- Temperature: 72 - 82° F (22 - 28° C)
- Specific gravity (Salinity): 1.023 to 1.025
- Water Movement: No special requirements, it can tolerate a rather stronger flow but slow-moving water is preferable.
- Water Region: They will spend time in all parts of the aquarium
Social Behaviors They are found singly or in pairs in the wild. Generally peaceful in the aquarium but can be aggressive towards other Emperor Angelfish and other large angelfish species. They will harass smaller fish like gobies, clownfish and blennies. Because they establish territories that they will defend, they should be the last fish you introduce into the tank.
In a reef environment they will eat at Large Polyp Stony Corals (LPS), most soft corals, Zoanthids, and Tridacnid clams. Use caution with Small Polyp Stony Corals (SPS), even SPS corals are not always safe from these coral carnivores. They may be a threat to small decorative shrimp as well.
Sex: Sexual differences It has been stated that the blue in front of the eye mask is more blue in male Emperor Angels, and gray blue in females.
Breeding/Reproduction The Emperor Angelfish pair will spawn once a year. In the Marshall Islands, they spawn August and September. Males will have 2 or more females in their harem, with each female having their own territory. It is possible, like other Pomacanthus, that they ascend in the water column, circle each other and simultaneously release their sperm and eggs at the pinnacle of their accent. The larvae float in a planktonic stage for a few weeks before turning into fry.
See Breeding Marine Fish for a description of how they reproduce in the wild.
Fish Diseases Emperor Angelfish, like other saltwater angelfish, are prone to any disease that captive saltwater environments have to offer. Stress due to various reasons will cause illness, like inappropriate housing or tank mates to commotion outside the tank, will make the fish ill. The Imperator Angel is sensitive and can develop bacterial infections and internal and external parasites. Keeping them quarantined for at least 2 weeks is recommended.
Saltwater Ich or White Spot Disease (Crypt) is the most common of disease, and is generally associated with marine tangs and angelfish. Symptoms of Marine Ich are constant scratching, culminating with lots of white dots. These dots disappear for a few days, only to return with double the number. This results in the fish suffocating from these parasites blocking the gills from providing oxygen. One suggestion is putting your tank just at least 82°F (28°C) since that will prevent the parasite from completing its life cycle, which includes the attachment to fish. Several preparations are also available for this parasite.
Seachem has awesome products for treating Marine Ick, Focus and Metronidazole. The Focus (bonding agent) is mixed 5 to 1 with their Metronidazole (one part Metro to 5 parts Focus). This combo is mixed with 1 Tablespoon of food and can be fed to the fish 3 times a day until symptoms are gone. This can be used in a reef aquarium since the medication is bound to the food. In combination, the higher temperature along with the food/medication combo, will provide timely relief.
Diseases that saltwater angelfish are susceptible to:
- Marine Ich (white spot disease)
- Marine Velvet
- Lymphocystis (a viral infection)
Availability The Emperor Angelfish or Imperator Angelfish is moderately easy to find online and in stores, but rather expensive
- Animal-World References: Marine and Reef
- Helmut Debelius and Rudie H. Kuiter, World Atlas of Marine Fishes, (in German) Hollywood Import & Export, Inc., 2006
- Scott W. Michael, Angelfishes & Butterflyfishes: Reef Fishes Series , Microcosm Ltd, 2004
- Scott W. Michael, Marine Fishes: 500+ Essential-To-Know Aquarium Species, T.F.H Publications inc., 1999
- Mark Allen, Roger Steene and Gerald R. Allen, A Guide to Angelfishes and Butterflyfishes , Odyssey Publishing, 1998
- Dr. Gerald R. Allen, Butterfly and Angelfishes of the World Volume 2, Aquarium Systems; 3rd edition,1985
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