Distinctive Characters: Dorsal fin with 8 spines and 13 rays. Anal fin with 3 spines and 11 rays. Pectoral fin with 15 rays. Body depth 3.7-4.0 in standard length. Snout extremely long and slender (except small juveniles), its length more than half length of head. Caudal fin changes from truncate in initial phase fish to emarginate with prolonged lobes in terminal males.
Colour: Females brown, pale below. Males dark blue-green with pale green dorsal, anal and posterior crescent of caudal fin; rear edge of pectorals blue.
Habitat and Biology: Found mostly on coral and rocky reefs to depths of 15 m. Feeds on small invertebrates that it picks from cracks and crevices in coral and rock with its elongate jaws.
Distribution: Indian Ocean.
Remarks: With its distinctive shape, Gomphosus caeruleus is impossible to confuse with any other Maldivian
fish species. Coloured differently in the Red Sea where it has been named G.c. klunzingeri by Klausewitz.