Debnath et al. (2005) showed that phytase at 500 U/kg feed gave higher weight gain, apparent net protein utilization and energy retention value in Pangasius pangasius fingerlings. In a related study, Debnath et al. (2004) showed that the whole-body content of Ca, P, Zn, Fe, Cu, and Co was elevated in fish fed diets supplemented with phytase