EFFECT OF DIETARY ROSEMARY (ROSMARINUS OFFICINALIS) ON GROWTH, SURVIVAL, DISEASE RESISTANCE AND HEMATOLOGY OF ROHU (LABEO ROHITA)
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Date
2019
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KARNATAKA VETERNARY, ANIMAL AND FISHERIES SCIENCES UNIVERSITY, BIDAR
Abstract
Phytoadditives are the natural substances that don’t pose any threat to fish and human health and to the environment.There has been a worldwide trend for the immunostimulants and bioactive compounds derived from medicinal plants. The developing interest in medicinal plants has increased globally because they are easy to prepare, cheap and have very less side effects on animals and the environment unlike antibiotics and other drugs. The present investigation has been undertaken to study the effect of dietary rosemary(Rosmarinus officinalis) on growth, survival, disease resistance and hematology of rohu (Labeo rohita). The fishes fed for 90 days with rosemary dietary incorporation at 0.5%, 1.0%, 1.5% and 2% levels including basal diet (control). There was significant (p<0.05) increase in growth parameters (weight gain, specific growth rate and FCR) in fishes fed with dietary incorporation of rosemary at 1% compared to control. The hemato-biochemical indices were examined for pre and post challenge studies against Aeromonas hydrophila pathogen. The erythrocytes and haemoglobin in pre-challenge showed significantly higher numbers. The number of WBC significantly increased in the post-challenge. The biochemical indices, total serum protein was significantly increased for fish fed with 0.5% rosemary. Whereas, feeding of rosemary incorporated feed resulted in reduction in serum glucose, serum magnesium and serum cholesterol levels in fish. The dietary incorporation of rosemary at 0.5% increased resistance against Aeromonas hydrophila in fish. The present investigation showed that dietary incorporation of rosemary improved growth performance, survivality by stimulating the immune response which makes the rohu more resistant to Aeromonas hydrophila .