Abstract
Fermented rice bran, when used as a carbon source in a biofloc system, can improve water quality, growth, and feeding efficiencies of cultured species. The present study delves into the effect of fermented rice bran as a carbon source on the growth and survival of Genetically Improved Farmed Tilapia (GIFT) fry. Additionally, the study investigated its impact on water quality, intestinal histology, proximate composition of fish and biofloc, total plate count of the experimental tank, and fish gut in the biofloc system. The study employed a completely randomized design with five different treatments: NFRB+BFT (Non-Fermented Rice Bran), FRBW+BFT (Fermented Rice Bran with Water), FRBP+BFT (Fermented Rice Bran with Probiotic), FRBY+BFT (Fermented Rice Bran with Yeast), and a clear-water system (with daily water exchange of 10%). The experimental duration was 60 days. The GIFT fry with an average weight of 1.04 ± 0.02 g were randomly distributed in High Density Polythene (HDPE) tanks of 110 L capacity at a stocking density of 250 individuals (ind.) m−3. Results indicated that the weight gain %, length gain %, Specific Growth Rate (SGR), and Protein Efficiency Ratio (PER) in FRBP+BFT and FRBY+BFT treatments were similar, with no significant differences (p > 0.05) and significantly higher (p < 0.05) than other treatments. At the end of the experiment, FRBP+BFT and FRBY+BFT treatments showed lower ammonia-N values. The histological study of GIFT showed a number of villi and villi length in FRBP+BFT and FRBY+BFT were similar with no significant differences (p > 0.05). The protein, lipid, and ash content of fish and biofloc were similar with no significant differences (p > 0.05) in FRBP+BFT and FRBY+BFT treatments. The total plate count of fish gut and water in FRBP+BFT and FRBY+BFT treatments was similar and significantly higher (p < 0.05) than the other treatments. Overall, the results indicate that rice bran fermented with both probiotic and yeast as a carbon source showed similar growth performance and improved water quality in rearing GIFT fry in a biofloc system.
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