Enhancing of Heteropneustes fossilis (Bloch, 1794) Fry Nursery Rearing Through Biofloc Technology (BFT): A Sustainable Approach for Bangladesh’s Aquaculture Sector
Enhancing of Heteropneustes fossilis (Bloch, 1794) Fry Nursery Rearing Through Biofloc Technology (BFT): A Sustainable Approach for Bangladesh’s Aquaculture Sector
Shaila Akter1, MD Zobayer Rahman2*, Farzana Islam1, Zamal Hussan1, Rasel Mia3, Kazi Rabeya Akther1, Nirmal Chandra Roy1
ABSTRACT
Biofloc has recently gained popularity due to its profitable components, mostly focused on developing microorganisms that swiftly convert floc chemicals into feed for H. fossilis. The investigation focused on the nursery rearing of H. fossilis fry in non-biofloc (T1) and biofloc (T2, T3 and T4) reared systems for 60 days to examine growth without exchanging water. At the same time, water quality metrics were carefully monitored and maintained. The stocking density in all tanks was 800 fry of H. fossilis initial weight of (0.51±0.02 g)/1000 liters of water in an outdoor fish hatchery. During the trial, additional commercial floating powdered feed was administered. Finally, species obtained an average weight of 2.82±0.14 g, a final length of 9.0±0.40 cm, a mean final weight gain of 2.82±0.14 g, and a relative growth rate of 589.67±55.70%, lower FCR of 0.78±0.03 value with maximum growth. These changes took place during the T2 trial, keeping the feed ratio at 75% feed and 25% floc. The survival rate, on the other hand, remained constant throughout all treatments. Only two parameters (specific growth rate and protein efficiency ratio) were discovered to have maximum output within the control. Throughout the trial, several water parameters were discovered to be optimal in each tank. During the experiment, BFT kept in T2 (75% feed + 25% floc) trail optimized the most desirable traits of growth for H. fossilis fish fry.
Novelty Statement | This study introduces a novel approach for nursery rearing of H. fossilis fry in outdoor hatcheries, showing that a 75% feed and 25% floc mixture (T2) significantly enhances growth metrics-such as weight gain, length, and feed conversion ratio-without water exchange. The findings demonstrate BFT’s potential to improve feed efficiency, maintain water quality, and sustain high survival rates, offering a resource-efficient strategy to advance sustainable aquaculture practices.
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