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Subject: Aquaculture × Author: M. JUNAID SIDIQ., × End date: 2019 × Start date: 2017 × Thesis Type: M.F.Sc ×
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    ThesisItemOpen Access
    EVALUATION OF FORMIC ACID SALT, POTASSIUM FORMATE AS A FEED ADDITIVE AND ITS INFLUENCE ON GROWTH AND HEALTH OF INDIAN MAJOR CARP LABEO ROHITA
    (KARNATAKA VETERINARY, ANIMAL AND FISHERIES SCIENCES UNIVERSITY, BIDAR., 2019) M. JUNAID SIDIQ.,; E.G. JAYRAJ
    Organic acids in various forms can be used as dietary supplements in aquaculture. This study was conducted to evaluate the use of a formic acid salt, potassium formate as a feed additive to enhance growth and health in rohu fish. A total of 120 healthy Labeo rohita fingerlings with an average body weight of 8.00 ± 0.5 g (mean ± SE) were randomly divided into four equal groups (T0, T1, T2, and T3). T0 was fed a basal diet with no organic acid additive taken as the control group, while T1, T2, and T3 were fed the diets supplemented with 10, 20 and 30 g/kg of potassium formate salt, respectively. Each group was subdivided in triplicate with 10 fish in each. The experimental fish was evaluated after 90 days for growth performance, hematology, immunology, biochemistry, gut microbiota, resistance to infection, body composition and gut, kidney and liver histology. The antibacterial activity of potassium formate was evaluated by well-diffusion assay. At the end of the feeding period, T1 and T2 had significant improvements in final body weight (FBW), weight gain (WG), specific growth rate (SGR) and food conversion ratio (FCR) compared with other groups. The total erythrocyte count, hemoglobin content, platelet count, mean corpuscular hemoglobin and total leukocyte count were significantly increased in T1 and T2 compared to T0 and T3. There were significant differences among the groups in mean corpuscular hemoglobin concentration with T3 as highest. After 90 days, T1 and T2 showed highest superoxide anion activity, lysozyme activity, and total serum protein, albumin and globulin concentration. The highest albumin-globulin ratio was found in T0. The lowest values for immune parameters were recorded in T0. Serum biochemical parameters like alanine aminotrasferase activity (ALT), aspartate aminotransferase activity (AST) and alkaline phosphatase (ALP) were not affected. Serum glucose and cholesterol levels were significantly lower in treatments than control. The protein and fat contents of the whole body were the highest in T1 and T2 groups. The widest inhibition zones against Aeromonas 149 hydrophila were at the 30, 40 and 50% concentrations of potassium