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Emperor Angelfish
Category: Saltwater Reef Fish

About

The Emperor Angelfish is a visually stunning marine fish known for its dramatic color transformation from juvenile to adult, with blue and yellow stripes and a distinctive eye mask. It’s popular in aquariums and coral-rich reef environments.

Scientific Name

Pomacanthus imperator

Habitat

Coral reefs and rocky ledges across the Indo-Pacific, including the Red Sea, Hawaii, and the Austral Islands, between depths of 1–100 meters.

Conservation

Not listed as endangered, but habitat degradation and overcollection for the aquarium trade are concerns in some regions.

Lifespan

Typically 15–20 years with proper care in captivity.

Fun Fact

Juvenile emperor angelfish exhibit a mesmerizing spiral pattern that helps reduce aggression from adults; adults develop a black mask across the eye to confuse predators.

Diet

Omnivorous – feeds on sponges, tunicates, algae, and encrusting organisms. In captivity, they require a varied diet with marine algae, sponge-based frozen foods, and supplements.

Average Size

Up to 40 cm (16 inches).

Location / Placement info

Displayed in the Coastal Reef Exhibit, near the Ocean-View Tunnel

FAQ

What is the lifespan of the Emperor Angelfish?

Emperor Angelfish can live up to 20 years or more in captivity with excellent care.

What do Emperor Angelfish eat?

They are omnivores, feeding on sponges, algae, tunicates, and marine angelfish diets.

Are Emperor Angelfish aggressive?

They are semi-aggressive and may become territorial, especially toward other angelfish.

What is the ideal tank size for Emperor Angelfish?

A minimum of 220 gallons is recommended due to their size, activity, and territorial behavior.

Do Emperor Angelfish need a reef environment to survive?

No, they are not reef-safe and may nip at corals and sessile invertebrates.

How big do Emperor Angelfish grow?

Emperor Angelfish can grow up to 15 inches (38 cm) in length.

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