Mean ± SD (range) of final weight, weight gain, FCR, survival and biomass of L. vannamei after 40 days of growth in 24 h with light (24WL), 12 h with light/12 h without light (12WL/12WOL), and 24 h without light (24WOL). Means within a row followed by different superscript letters were significantly different (P < 0.05).