ASSESSMENT OF HERBAL EXTRACT FOR GROWTH AND NUTRITIONAL QUALITY OF JUVENILE FRESHWATER PRAWN (Macrobrachium rosenbergii) UNDER BIOFLOC SYSTEM

Abstract

The study was conducted in the Biofloc Lab, Department of Aquaculture, Sher-eBangla

Agricultural University to assess the potentiality of Macrobrachium rosenbergii, growth performance and its nutritional quality in Biofloc Technology (BFT) from July to November, 2020. Total five treatments were applied including T1 (Control), T-2 (Extract

of Ginger), T-3 (Extract of Amla), T-4 (Extract of Garlic) and T-5 (Extract of Garlic and higher stocking) with three replications. The initial mean stock weight of prawn were 3.14±0.19, 3.04±0.27, 3.26±0.16, 3.36±0.06 and 3.02±0.36g in T-1, T-2, T-3, T-4 and T-5 respectively. After completing the research duration, the highest mean weight gain and percentage weight gain were 10.9±0.3g and 297.8±16.2% noticed in the T-3. The survival rate was maximum (99.5±0.8%) in the control treatment. The best FCR and SGR were 1.2±0.1 and 2.1% also noticed in the T-3. During the research 35% protein containing commercial feed was given and floc was produced at balanced level which was found 21.7% protein. From the proximate composition analysis, the highest protein percentage of prawn 74.13±.68% was found in the T-3. The best growth performance and nutritional value was observed in T-3 (Extract of Amla) compared to other treatments and also tells the immense possibility of M. rosenbergii culture in biofloc in the era of aquaculture and microbial biotechnology for mitigating the demand of animal protein.