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Subject: Aquaculture × Author: ANANDA, M. G., × End date: 2019 × Start date: 2019 × Thesis Type: M.F.Sc ×
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    EFFECT OF DIETARY BAY LAUREL (LAURUS NOBILIS) ON GROWTH, SURVIVAL, DISEASE RESISTANCE AND HEMATOLOGY OF ROHU (LABEO ROHITA)
    (KARNATAKA VETERINARY, ANIMAL AND FISHERIES SCIENCES UNIVERSITY, BIDAR, 2019-08) ANANDA, M. G.,; GANAPATHI NAIK
    Aquaculture is one of the promising and fastest growing food-producing sectors in the world. Aquaculture intensification practices lead to overcrowding and poor water quality, facilitating the spread of infectious disease outbreaks which cause heavy loss to farmers. However, the application of antibiotics and chemicals in culture ponds is often expensive and undesirable. Medicinal plants have a potent defense against harmful pathogenic bacteria. There is a growing interest in the use of medicinal plants as an alternative to antibiotics and immune prophylactics. The present investigation has been undertaken to study the effect of bay laurel (Laurus nobilis) on growth, survival, disease resistance and hematology of rohu (Labeo rohita). Fish fed with bay laurel supplemented diet showed significantly enhanced (p < 0.05) weight gain, specific growth rate and feed conversion ratio compared to control. Hemato-biochemical indices were examined after 90 days of feeding trial and after fish challenged against Aeromonas hydrophila pathogen containing 1.68×106 CFU/ml. Bay laurel incorporated diet fed fish showed a significant increase in red blood cells and haemoglobin in pre-challenge compared to control. The number of WBC significantly increased in both pre and post- challenge (p < 0.05) and fish fed with 1.5% bay laurel exhibited higher WBC count in pre-challenge compared to control. The serum protein content was significantly increased in fish fed with bay laurel incorporated diet. However, feeding of bay laurel incorporated diets showed a reduction in serum glucose, serum cholesterol and serum magnesium level than the control group. The dietary incorporation of bay laurel at 1.5% and 2% increased resistance against A. hydrophila. The findings of the present study reveal that bay laurel may enhance growth and immune response in rohu.