Biochar as a feed supplement for nutrient digestibility and growth performance of Catla catla fingerlings

The purpose of the current research was to determine the impact of various biochar supplements on nutrient digestibility and growth performance of Catla catla fingerlings fed on Moringa oleifera seed meal (MOSM) based diet. An experiment with 90 days of feeding was conducted to investigate the efficacy of biochar obtained from different sources such as parthenium, farmyard manure, poultry waste, vegetable waste, and corncob waste at 2 mg/kg. There were15 fingerlings in each tank in the triplicate set of tanks. Fingerlings were fed at the rate of 5 % of their live wet weight. From each tank, feces were collected twice daily and stored to determine nutrient digestibility. Results showed that poultry waste biochar (test diet-IV) at 2 mg/kg was the best source to significantly (P < 0.05) improve weight gain % (256.58 %) and feed conversion ratio (1.19) than the other biochar sources and control diet. Furthermore, in terms of nutrient digestibility, optimum fat (81.90 %), protein (75.92 %), and gross energy (74.84 kcalg^-1) values were obtained by using the same type of biochar (poultry waste). Conclusively, among all the five biochar sources, poultry waste biochar proved to be the best one, improving fish body performance.