Effect of biofloc technology on growth performance, digestive enzyme activity, proximate composition, and hematological parameters of Asian stinging catfish (Heteropneustes fossilis)

Abstract

ABSTRACT This investigation aimed to evaluate the effects of the biofloc system on growth, digestive activity, proximate composition, and hematology of Asian stinging catfish for 120 days. Fingerlings (n = 2,700; 4.40 ± 0.10 g) were randomly distributed in six outdoor circular tanks (3,000 L) with supplementary aeration and hand-fed with a commercial diet (35% CP) at 5%–2% of the biomass in the control group and 2%–1% in the biofloc group (sugarcane molasses) to establish a (C/N) ratio 10:1. Ammonia, nitrate, nitrite, and total suspended solids were significantly lower in the BFT than in the control (P < 0.05). Suspended floc significantly ameliorates mean weight gain, percent weight gain, mean total biomass, specific growth rate, and feed utilization compared to the control (P < 0.05). Protease and amylase activity in the intestine and liver lipase activity of fish were found to be significantly higher in the biofloc group (P < 0.05). An improved hematological profile was observed in the biofloc groups (P < 0.05). The crude protein and lipid content was also higher in the biofloc system than in the control. This study indicates that biofloc would be the best alternative approach for sustainable aquaculture production of Asian singing catfish.