Kuhlia sandvicensis (Steindachner, 1876)
fish is described in both my Hawaii fish books and is illustrated with
a photo of juveniles in a tidepool. Here is a better photo, taken at Honuapo
(Whittington Beach Park), Hawai`i, in about 1 ft of water. An alternate
name for this fish is Reticulated Flagtail.