Whitetail Surgeonfish Identification Guide

Key identification features

• Slender, fusiform body noticeably less deep than most other surgeonfish
• Overall dark chocolate-brown to blackish coloration over the whole body
• Sharply contrasting pale to white caudal fin, the source of its common name
• Forked tail shape with elongated upper and lower lobes
• Small whitish caudal spine tucked at the base of the tail
• Adult size generally under 27 cm

Common look-alikes

Blackstreak (epaulette) surgeonfish is similarly dark-bodied but keeps a dark tail rather than a pale one. Other schooling, plankton-feeding surgeonfish seen hovering in midwater can look similar in silhouette from a distance, but few combine such a slim body with a strongly two-toned dark-body, pale-tail pattern that flashes clearly as the school turns.

Where you'll see one

Whitetail surgeonfish range across the Indo-Pacific along outer reef drop-offs and current-swept slopes, where they commonly form large midwater aggregations, picking zooplankton from the water column rather than grazing algae on the bottom like most relatives, often mixing with other planktivorous reef fish.