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Journal of Fisheries and Aquatic Science
Year: 2013  |  Volume: 8  |  Issue: 2  |  Page No.: 305 - 322

Relative Efficacy of Two Probiotics in Controlling the Epizootic Ulcerative Syndrome Disease in Mrigal (Cirrhinus mrigala Ham.)

Parvati Sharma, Ram C. Sihag and S.K. Gahlawat    

Abstract: The Epizootic Ulcerative Syndrome (EUS) is a dreaded disease of mrigal (Cirrhinus mrigala Ham.) inflicting heavy mortality in the latter fish at the farmers’ ponds. To realize a good harvest, the control of this disease through the use of some probiotics is most important. The aim of study was to ascertain the effect of two probiotics on various blood and life parameters of mrigal (C. mrigala). Two commercially available probiotics with different compositions were tested for this purpose. In vitro trials were performed by the usual ‘well poisoning method’ whereas in vivo trials were performed in the fishes that were subjected to induced pathogenicity. In the treated fishes, periodic observations were recorded on their different hematological (viz., amount of hemoglobin, total erythrocyte count and total leukocyte count), survival and growth (length and weight) parameters. In the in vitro trials both probiotics developed clear zones of inhibition. However, the zone shown by probiotic-1 (having bacteria only) was smaller in size than that by probiotic-2 (in addition to bacteria also having vitamins, enzymes and salts), revealing the probable greater efficacy of the latter than the former. In the in vivo trials, the values of all the hematological parameters were found to decrease (leukocyte count increased) in the fish having induced pathogenicity and so were survival and growth parameters. But these values showed significant increase (leukocyte count decreased) in the probiotic treated fishes. This confirmed the useful role of both the probiotics in controlling the EUS disease in the mrigal. However, probiotic-2 was found to be more effective than probiotic-1 in increasing the hematological parameters and growth and survival in this fish.

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