A rover species present in Hawaii waters was reared from a small number of eggs collected in waters off the west side of Oahu in May, 2012. Rover larvae (Emmelichthyid sp.) are rather featureless and have limited specializations for pelagic life, aside from weak head spination. They look similar to the larvae of some damselfish (pomacentrid) and jack (carangid) species but are less pigmented in the early larval stages, e.g., pre-flexion and flexion. The pelagic juveniles have dark vertical bands on the body. The larval development of this rover species is quite rapid with a larval period of only about 20-25 days. The larvae have a large mouth at first feeding and easily feed on copepod nauplii. They do not have any special rearing requirements and can probably be raised quite well on a rotifer/artemia diet.

Pelagic Juvenile Hawaii Rover (Emmelichthyid) species reared in the laboratory.
Pelagic Juvenile Hawaii Rover (Emmelichthyid) species reared in the laboratory.

Rovers could make good candidates for aquaculture based on their excellent flesh quality, their short larva period, fast growth and uncomplicated rearing requirements of the larvae. Further studies to evaluate the efficacy of captive spawning adults, raising the larvae in numbers and growing out the juveniles to market size are needed.

Hawaii Rover (Emmelichthyid) larvae reared in the laboratory.
Hawaii Rover (Emmelichthyid) larvae reared in the laboratory.