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The effects of dietary protein and energy level on spawning performance of Nile tilapia broodstock and hatchability of their eggs were studied. Nine diets containing three protein (30, 35 and 40%) and three energy (14.6, 16.7 and 18.8 MJ GE/kg) levels were prepared. The diets were fed to duplicate groups of broodfish (average weight of 60.5±4.6 g for males and 39.4±3.1 g for females) at 2–3% of their...
The effect of photoperiod on survival, growth rates and feed utilization efficiency of Nile tilapia (Oreochromis niloticus L.) fry and fingerlings was investigated in two consecutive experiments. In Experiment 1, triplicate groups of 75 swim-up fry (0.02 g) were stocked in 25-l fiberglass tanks, in recirculating indoor system. The fish were exposed to four photoperiod (light:dark, L:D) cycles (24L:0D,...
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