For comparison, a negative control diet
(0.41% total P; 0.15% non-phytate P; no phytase added) and a positive control diet (0.88% total P; 0.62% non-phytate P; no
phytase added) were used. Experimental diets with graded levels (500, 750, 1000, 1250 FTU/kg) of two different sources of
microbial phytase (experimental phytase SP 1002; RonozymeRP) were assigned in four repetition tanks and fed to juvenile all
male Nile tilapia (average body weight 13.50 g) for 60 days.