A total of 2400 O. niloticus fries (mean individual initial weight 4 ± 1.0 g) 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 4 rows). 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 (1 perhapa). The water was partially renewed daily and monitored regularly and maintained at 25 ± 1 C. The whole experimental work was carried out at the experimental units of The World Fish Center (Abbasa, Sharkia, Egypt) and was
approved by ethical committee of Faculty of Veterinary Medicine, Cairo University
A total of 2400 O. niloticus fries (mean individual initial weight 4 ± 1.0 g) 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 4 rows). 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 (1 perhapa). The water was partially renewed daily and monitored regularly and maintained at 25 ± 1 C. The whole experimental work was carried out at the experimental units of The World Fish Center (Abbasa, Sharkia, Egypt) and was
approved by ethical committee of Faculty of Veterinary Medicine, Cairo University
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