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Efficacy of oxytetracycline and potentiated sulphonamide oral therapies against Aeromonas hydrophila infection in Nile tilapia Oreochromis niloticus

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Journal of Coastal Life Medicine 2017年第9期5卷 371-374页

作者： Thangapalam Jawahar Abraham Anwesha Roy Roy Beryl Julinta jasmine singha Prasanna Kumar Patil Department of Aquatic Animal Health Faculty of Fishery SciencesWest Bengal University of Animal and Fishery SciencesChakgariaKolkataWestBengalIndia Central Institute of Brackishwater Aquaculture Indian Council of Agricultural ResearchRaja Annamalai PuramChennaiTamil NaduIndia

Objective: To assess the efficacy of feeds containing approved antibiotics, viz., oxytetracycline (OTC) or potentiated sulphonamide [(sulphamethoxazole-trimethoprim) SMZ-TMP] at 1 g, 2 g, 3 g and 4 g of respective antibiotics/kg feed at 2% body weight ration in preventing the Aeromonas hydrophila (A. hydrophila) infection in Oreochromis niloticus. Methods: Commercial pellet feed was top dressed with respective antibiotics using 5 mL vegetable oil as a binder. Fish were injected intramuscularly with A. hydrophila at ≈ 6.0 × 107–8.6 × 107 CFU/fish, and fed subsequently with OTC and SMZ-TMP feeds for 10 and 5 days, respectively. Fish mortalities were recorded during the pre-treatment, treatment and post-treatment periods. Results: Highest mortalities (7.42%–8.33%) were observed in challenged and untreated fish. The mortalities observed in fish fed with OTC or SMZ-TMP were 0%–6.66% with decreasing concentrations of antibiotics from 4 to 1 g/kg feed. Significant differences existed in the mortalities among fish fed with different doses of antibiotics (P < 0.05). The relative percent survival values were 20, 40, 40 and 60 for 1 g, 2 g, 3 g and 4 g OTC/kg feed groups, respectively;while in SMZ-TMP fed fish, the respective relative percent survival values were 10, 100, 100, and 100. Conclusions: The fish fed with feed containing 2 g antibiotic/kg at 2% body weight was the lowest concentration that recorded significantly lower mortality (P < 0.05), which could be the treatment of choice for the control of A. hydrophila in Oreochromis niloticus in tropical condition.

关键词： Aeromonas hydrophila Oreochromis niloticus Oxytetracycline Potentiated sulphonamide

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