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The sleek, silver fish with the prominent yellow horn-like protrusion on its head is a Bluespine Unicornfish (Naso unicornis). My… The sleek, silver fish with the prominent yellow horn-like protrusion on its head is a Bluespine Unicornfish (Naso unicornis). My decades of marine biology experience have led me to appreciate the fascinating adaptations of the surgeonfish family. This species is easily recognizable by its unique "horn," which is more pronounced in males and develops as they mature. The horn is thought to be a signal of health and fitness to potential mates. This fish plays a crucial role as a grazer in the coral reef ecosystem, feeding primarily on macroalgae. They are found throughout the Indo-Pacific, where they school together in groups to safely graze on algae and other organic material. Their streamlined body and sharp, scalpel-like spines at the base of their tail—which give the surgeonfish family its name—are perfectly suited for life on the reef.