|size||Up to 40cm|
|locality||Around reefs well above the bottom|
|behaviour||Sometimes hiding in holes; sometimes eating zooplankton high in stream above reef|
|range||Tropical Indian and Pacific Oceans|
Classic trigger-shape: symmetrical rear dorsal and anal fins but larger, rounded and not even width like other triggers. Lobes on the tail and as the name suggested: blue all over. Not to be confused with the Redtooth where the head is a paler blue than the body.