Distinctive Characters: Dorsal fin with 11-12 rays. Anal fin with 10-11 rays. Pectoral fin with 16-17 rays. A ridge of skin mid-dorsally. Snout conical and attenuate. Caudal fin slightly rounded.
Colour: Brown dorsally on head and body shading to whitish ventrally with small pale blue spots on body and basally on caudal fin. Small dark brown spots on lower side mixed with blue, and blue lines radiating from eye. Numerous close set small pale blue spots or irregular lines on cheek.
Habitat and Biology: Occurs in shallow outer reef areas, often in the lower reaches of the surge zone to depths of 10 m. Omnivorous; feeding on algae and a wide variety of benthic animals.
Remarks: Canthigaster amboinensis is one of the faster swimming species of the genus. They have a repelling substance in their skin, which protects them from predators.