There are several native species that occur at normal diving depths in Hawaii, in addition to two waifs and one aquarium release.
Angelfishes differ from Butterflyfishes in having a large spine on the preopercle.
Diet varies by species, from algae to sponge or zooplankton. Larvae settle and grow to maturity but fail to locate a mate. This situation is now confused by unwanted aquarium pets being released illegally into nearshore waters.