The Blacktongue Unicornfish, Black Unicornfish, Nohorn Unicorn, Sleek Unicornfish, and Thorpe’s Unicornfish (Naso hexacanthus) is a species of fish belonging to the family Acanthuridae, commonly known as surgeonfishes. This species is a vibrant addition to the underwater world, with a striking appearance and intriguing habits.
Description & Characteristics
The Naso hexacanthus is a relatively large fish, with a maximum recorded size of 75.0 cm. It possesses a sleek, elongated body, with a distinctive dorsal fin that runs along its back, ending in a pointed tip. This species is characterized by its dark coloration, ranging from shades of gray to black, often with a lighter belly. Notably, they lack the prominent horn that is characteristic of some other unicornfish species, hence their common name, “Nohorn Unicorn.” They are also known as “Thorpe’s Unicornfish” after the person who described the species.
Habitat and Occurrence
Naso hexacanthus can be found in a variety of marine environments, with a depth range spanning from the surface down to 150.0 meters. They prefer coral reefs and rocky areas, where they can find shelter and an abundance of their preferred food sources. This species is commonly observed in the Indo-Pacific region, extending from the Red Sea to the Pacific Islands.
Taxonomy
The species Naso hexacanthus belongs to the Class: Teleostei, Order: Acanthuriformes, and Family: Acanthuridae. This classification places it within a diverse group of fish known for their sharp, scalpel-like spines located near their tails, which they use for defense.
Feeding
Naso hexacanthus is an herbivorous species, feeding primarily on algae. This includes both filamentous algae and encrusting algae, which they graze on using their specialized teeth. In captivity, they can be fed a variety of foods, including flakes, frozen foods (especially larger sorts), and mysis shrimp. Their diet is crucial for maintaining their health and vibrant coloration.
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