2.1 Fish
A total of 2400 O. niloticus fries (mean individual initial weight 4 ± 1.0 g) were obtained from Abbasa hatchery,
they were divided into six equal groups, each consisting of four replicates (100 fry/replicate) in 6 separate
earthen ponds, Fish in each replicate were reared in a hapa made of cotton mesh like a cage (3 × 2 × 1 m, each)
that was fixed in an earthen pond (for each group, a total of 4 hapas were equally arranged in 4rows). The whole
experiment was done at the experimental units of The World Fish centre, Abbasa, Sharkia, Egypt. The Fish were
fed twice daily on a basal diet of 35% protein at 10% of body weight per day. The feed was placed in plastic
trays fitted in the hapas (one per hapa). The water was partially renewed daily and monitored regularly; the water
temperature was maintained at 25 ± 1°C.
2.1 FishA total of 2400 O. niloticus fries (mean individual initial weight 4 ± 1.0 g) were obtained from Abbasa hatchery,they were divided into six equal groups, each consisting of four replicates (100 fry/replicate) in 6 separateearthen ponds, Fish in each replicate were reared in a hapa made of cotton mesh like a cage (3 × 2 × 1 m, each)that was fixed in an earthen pond (for each group, a total of 4 hapas were equally arranged in 4rows). The wholeexperiment was done at the experimental units of The World Fish centre, Abbasa, Sharkia, Egypt. The Fish werefed twice daily on a basal diet of 35% protein at 10% of body weight per day. The feed was placed in plastictrays fitted in the hapas (one per hapa). The water was partially renewed daily and monitored regularly; the watertemperature was maintained at 25 ± 1°C.
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