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Abstract
Tra catfish is one of the main export products of Vietnam’s fisheries sector. Recently, the use of antagonistic probiotics to inhibit the growth of bacterial pathogens present in Tra catfish ponds is one of the disease preventive solutions of interest. This study reports the positive effects of Bacillus amyloliquefaciens AGWT 13-031 in the survival rate of catfish fingerlings and pond water quality when this probiotic isolate was applied directly into the pond. After 40-day rearing, catfish in probiotic-treated ponds had the survival rate of 28,8% and the size of 160 fish kg-1, while those of the control fish was 7,2% and 150 fish kg-1, respectively. In addition, the mean body weight and total body length of probiotic-treated fish (1.45 ± 0.52 g, 53.27 ± 7.1 mm) were increased 12.40% and 5.55% respectively when compared to the control fish (1.29 ± 1.18g, 50.53 ± 11.16 mm). Water in the probiotic-treated pond was green enough due to the controlled amount of algae, resulting in suitable environment for zooplankton (Moina, rotifer…), a natural food source for fish. During the catfish fingerling rearing process, no additional biological products were used together with this B. amyloliquefaciens AGWT 13-031 isolate to improve water quality.
Key words: Bacillus amyloliquefaciens, Tra catfi sh, probiotic in aquaculture