Author(s): Md. Fazle Rohani, Md. Shafiqur Rahman, Shovon Sarker, Md. Masud Rana and Md. Sazzad Hossain

Abstract: This study aimed to evaluate the efficacy of whole wheat flour supplementation as prebiotic compound in feeds on the growth, survival rate and production of C. catla. A total of 144 fingerlings of mean initial weight of 6.85±0.45 g was stocked at the same stocking density (12 fingerlings per aquarium). Four different treatments (T1, T2, T3 and T4) each with three replications having different level of whole wheat flour such as 0% whole wheat flour (T1), 5% whole wheat flour (T2), 10% whole wheat flour (T3) and 15% whole wheat flour (T4). Feeds were supplied at 5% body weight twice daily in the morning at 9.00 am and in the afternoon at 5.00 pm throughout the study period. Weekly weights recorded and feed supplied was used to compute the growth parameters. Final weight (g), weight gain (g), percent weight gain (%), specific growth rate (%/day) and protein efficiency ratio (PER) varied from 13.49±0.27 to 15.63±0.88, 6.64±0.27 to 8.78±0.88, 96.95±3.88 to 128.11±12.79, 1.08±0.03 to 1.31±0.09, respectively. The gut microbiota of catla fish in case of TSA agar media ranged from 1.1~2.5×10⁵ to 3.3~7.2×10⁶ CFU/mL and in case of MRS agar media 1.0~3.0×10³ to 3.4~5.2×10⁴ CFU/mL were estimated. The highest range of bacterial colony was found in treatment 4 and the lowest bacterial colony was found in treatment 1. The growth performance was highest in treatment 3 followed by treatment 4, treatment 1, treatment 2 and the lowest FCR (2.28±0.25) was revealed in treatment 3 whereas the highest FCR was found in treatment 2 (2.99±0.14). The survival rate was 100% in all treatments. The result of present study indicate that prebiotic supplementation for catla has positive effects on the growth performance and the best result was obtained with a supplementation of 10% whole wheat flour.

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