Abstract
Eleven diets (D1 - D11), designated as treatments (T1 - T11), supplemented with different levels of inorganic phosphorus (P) (CaHPO 4 ) were fed to Heterobranchus bidorsalis (10.8 4 ) were fed to Heterobranchus bidorsalis (10.8 4 ) were fed to Heterobranchus bidorsalis (10.8 ± 0.02 g) to determine the optimum P requirement. D1 - D11 contained total P of 10.2, 10.4, 11.0, 11.9, 12.3, 12.6, 13.4, 13.9, 14.2 14.7 and 15.4 g kg -1 respectively. After 84 days of feeding trial, there was increase in fish growth up to T5 with 12.3 g P kg -1 diet, followed by consistent decline in growth towards T11 with the highest P content. However, fish in T5 had the best (P -1 diet as optimum requirement for the growth of Heterobranchus bidorsalis .
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