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Abstract
A probiotic product (PLANKTO PLUS) consisting adequate colony-forming units of beneficial bacteria was experimented for 90 days to evaluate the effect of growth of carp fingerlings. The selected probiotic was applied regularly @ 2 ml/tank (water volume 4 m3) to the carp fingerlings kept in fibreglass-reinforced plastic tanks under five different treatments, i.e. control (without probiotics), once in a day, weekly, fortnightly and monthly with two replicates. Tanks were stocked with Hypophthalmichthys molitrix, Labeo rohita and Cirrhinus mrigala @ 10 fingerlings/m3 in the ratio of 4:3:3, and water quality parameters were monitored regularly. The use of probiotic resulted in good conclusion by bringing feed cost down, improving water quality, increasing plankton concentration, quick breakdown of unused feed and checking algal bloom. The best result was obtained in the tanks with ‘weekly’ dose in the form of diverse assemblage of zooplankton, good condition factor and highest specific growth rate of the stocked fishes.
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