Dusky Grouper Epinephelus marginatus Growth and Survival When Exposed to Different Photoperiods

Photoperiod is considered an environmental factor that influences reproduction and the growth processes of fish throughout year. In present study, we subjected dusky grouper Epinephelus marginatus to different photoperiods in order evaluate survival. Juvenile were randomly distributed twelve 100 L tanks containing four per aquarium. The exposed continuous light, normal photoperiod or darkness for 50 days. Fish fed 3% their total biomass, twice a day, diet consisted ground commercial dry pellets (42% crude protein, 12% humidity, 9% ether extract, 15% mineral matter, 4% fiber, 3.5% calcium vitamin C, accordance with manufacturer’s instructions). There was no mortality during experiment. After days, best performance found exposure light (24 h artificial light). final weight reared under significantly higher than darkness. specific rate natural Modifications can be key increasing efficacy current production improvement aquaculture protocols.