《Table 4 Water quality parameters of diff erent experimental treatments (values are mean 1±SD (range

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《Floc meal as potential substitute for soybean meal in tilapia diets under biofloc system conditions》

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1 means in the same row with diff erent superscripts are signifi cantly diff erent（P0.05）.

The overall mean，standard deviation，and range of water temperature，dissolved oxygen and pH of the diff erent treatments are presented in（Table 4）.Water quality parameters were within the optimal range for the culture of tilapia.No signifi cant diff erences in water quality values were observed among treatments.Fish fed（FM 25）recorded the highest Floc volume during the whole experimental period especially after the fi fth week.Water temperature values were optimal for fi sh culture and ranged from 25–30°C.Dissolved oxygen remained within the recommended range for growth of tilapia.The DO average was kept above5 mg/L，which are within the recommended levels of DO as reported by Azim et al.（2008）.Ammonia-N，NO 2 and NO 3 values recorded for all treatments were within normal ranges（average of 0.39，0.71 and27.5 mg/L，respectively）.Total suspended solids and alkalinity were numerically higher in fl oc meal treatments compared to the control and increased with the increasing fl oc meal in the diet.