Koran angelfish juvenile

The Koran angelfish (Pomacanthus semicirculatus) is a large Indo-Pacific reef fish known for its dramatic color change as it matures—juveniles have striking blue and white curved stripes, while adults develop greenish bodies with blue edging and a yellow tail. It can grow up to about 15 inches (38 cm) long and is popular in the saltwater aquarium trade, though it requires a large tank due to its size and semi-aggressive nature.