Yellow margin triggerfish

Seen in Anita's Reef, Similan Islands, Thailand (2008).
Usually compressed body. Pelvic fins fused to one spine. First dorsal spine with locking mechanism . With 12 principal rays in caudal fin. 18 vertebrae . Upper jaw non-protrusible. Upper jaw usually with four teeth in outer and three in the inner series on each premaxillary . Capable of rotating eyeballs independently. Triggerfish normally swim by undulating their second dorsal and anal fins, but will use their tail for rapid bursts. Most triggerfishes are solitary diurnal carnivores , feeding on a wide variety of invertebrates including hard-shelled mollusks and echinoderms ; some also feed on algae or zooplankton . They lay demersal eggs in a nest which is aggressively guarded by the female, less often by the male.