A grey grazing chub of shallow rock, usually in loose schools in moving water.
To about 50 cm, though one source gives 38. Oval and compressed with a small pointed head and the snout sloping down abruptly just before the eyes, dark grey to silvery grey with faint brownish stripes between the scale rows. It can switch on a pattern of numerous eye-sized white spots within seconds.
That abrupt snout profile, and the absence of brassy stripes, separates it from the brassy chub.
Nought to about forty metres on shallow rock and coral, in large schools, grazing attached algae and occasionally taking plankton.
Ratings are per location: 1 means found on most dives that look for it, 5 means a handful of records. Where enough dives have been logged the figure is calculated from them; otherwise it is an editorial estimate, and says so. We publish habitat and destination, not the dive site.