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This brilliant marine species is a Blue Tang (Paracanthurus hepatus). As a marine biologist, I recognize this species as a… This brilliant marine species is a Blue Tang (Paracanthurus hepatus). As a marine biologist, I recognize this species as a quintessential inhabitant of Indo-Pacific coral reefs. Its stunning coloration is what makes it so distinctive: a vibrant royal blue body, a yellow tail, and a black pattern that sweeps from the eye to the tail. This fish is a herbivore, primarily feeding on algae. It plays a vital role in maintaining the health of coral reefs by preventing the overgrowth of algae, which can smother and kill the coral. The Blue Tang's body is very thin and disc-shaped, allowing it to navigate the intricate crevices and caves of the reef with ease. It is a social fish, often found in groups, which provides a measure of safety from predators.