At a glance the quick version
FishBase gives a maximum reported age of 14 years
Looks how to spot one
Large, deep-bodied marine angelfish
Adults are covered in thin yellow and blue horizontal stripes, with a pale blue face, a dark blue mask across the eyes, a yellow tail and a dark band behind the head edged in blue and yellow. Juveniles look like a different fish entirely: dark blue with white and pale blue rings in a target-like pattern.23
Personality what they are like
Semi-aggressive and confident once settled. It likes to stay near caves and overhangs.32
Daily activity how busy a day looks
A strong swimmer that needs lots of open water as well as caves to retreat to.32
Grooming and care the hands-on bits
Needs extensive rockwork with deep caves to feel secure, and live rock to graze. It will nip at stony and soft corals and clam mantles, so it suits a fish-only tank better than a reef.3
Home where they are happiest
A very large tank of at least 220 US gallons (about 830 L). Saltwater at about 22 to 26 °C, pH 8.1 to 8.4, dKH 8 to 12, specific gravity 1.020 to 1.025. In the wild it lives on coral-rich lagoon, channel and outer reefs from 1 to 100 m, often under ledges and in caves.312
Food basics what goes in the bowl
An omnivore. Offer a varied menu of spirulina and marine algae, a good angelfish food, and meaty items such as frozen mysis shrimp. In the wild it feeds on sponges, tunicates and other encrusting animals.312
Company who they like around
Wild adults often live in pairs. In an aquarium it is normally kept as the only large angelfish.12
The story where it all began
Marcus Elieser Bloch described the species in 1787 as Chaetodon imperator. The name comes from an older Dutch label, 'Emperor of Japan', given to the fish in 1719 because of its grand looks.21
Fun facts for the dinner table
- 1
When frightened, an emperor angelfish can make a knocking sound.2
- 2
Juveniles and adults sometimes clean parasites off larger fish.1
- 3
Pacific emperors have a trailing filament on the back of the dorsal fin, while Indian Ocean fish do not.2
- 4
It has made its way through the Suez Canal and has been found in the Mediterranean since 2009.2
- 5
Its name traces back to 1719, when it was called the 'Emperor of Japan'.2
Recognised by the official bits
- IUCN Red List
- Least Concern (assessed 2009)1
The care rhythm Furry Diary remembers it for you
A typical home-care rhythm for a Emperor Angelfish. It is our own starting plan, not a vet's advice, and you can change every line in the app.
- FeedingSmall amounts once or twice a dayevery day
- Temperature checkevery day
- Salinity checkevery week
- Top-upTop up evaporation with fresh RO water, not salt waterevery day
- Water testevery week
- Water changeAbout 10 to 20% of the waterevery 2 weeks
- Glass cleanevery week
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Where this comes from
Every breed page shows where each fact comes from. If we got something wrong, sorry, we are pet people, not a science magazine. Tell us at [email protected] and we will fix it.
- FishBase: Pomacanthus imperator, Emperor angelfish fishbase.seused for length, distribution, depth, habitat, diet, pairing, cleaning, lifespan, IUCN status, describer
- Wikipedia: Emperor angelfish en.wikipedia.orgused for colour description, size, distribution, habitat, sounds, history, etymology
- LiveAquaria: Emperor Angelfish liveaquaria.comused for aquarium care, tank size, water parameters, temperament, diet
Checked 2026-09-30. Text is written in our own words from these sources.