Bacillus sp. Mk22의 섭취가 Penaeus monodon 새우의 성장증진과 Vibrio parahaemolyticus와 흰반점바이러스(WSSV)의 감염 감소에 미치는 영향
Growth Enhancement of Shrimp and Reduction of Shrimp Infection by Vibrio parahaemolyticus and White Spot Syndrome Virus with Dietary Administration of Bacillus sp. Mk22
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The present study examined the effect of the dietary administration of a halophilic bacterium Bacillus sp. Mk22 on the growth improvement of black tiger shrimp, Penaeus monodon, and reduced shrimp infection by Vibrio parahaemolyticus and white spot syndrome virus (WSSV). The shrimp were fed 45 days using three experimental diets: no addition (control), commercial probiotic, and Bacillus sp. Mk22. The shrimp treated with the halophilic bacterium Mk22 showed a significant improvement of growth (7.1 ± 0.21 g), survival (94.3 ± 0.58%), weight gain (178 ± 4.93 g), and reduced feed conversion rate (0.8 ± 0.03 g) compared with the shrimp in the other groups. The shrimp treated with Bacillus sp. Mk22 also showed a lower Vibrio count (0.02 ± 0.01 × 102 CFU/ml) in the shrimp culture water compared with the other groups. The shrimp in the three groups were challenged with either Vibrio or WSSV. For the Vibrio infection, no mortality was observed from water infection or oral feeding infection in the commercial probiotic group and Mk 22 group. For the WSSV infection, a 68% survival rate from water infection and 20% survival rate from oral feeding infection was observed on day 45 in the Mk22 group, while 100% mortalities were recorded at a much earlier time in both the control and commercial probiotic groups. The antioxidant enzyme activities, indicators of oxidative stress, such as catalase and superoxide dismutase, significantly decreased in both the Vibrio and WSSV-infected Mk22 groups compared with the other groups, indicating that Bacillus sp. Mk22 was effective in reducing oxidative stress, possibly due to the reduced infection.
Abstract
The present study examined the effect of the dietary administration of a halophilic bacterium Bacillus sp. Mk22 on the growth improvement of black tiger shrimp, Penaeus monodon, and reduced shrimp infection by Vibrio parahaemolyticus and white spot syndrome virus (WSSV). The shrimp were fed 45 days using three experimental diets: no addition (control), commercial probiotic, and Bacillus sp. Mk22. The shrimp treated with the halophilic bacterium Mk22 showed a significant improvement of growth (7.1 ± 0.21 g), survival (94.3 ± 0.58%), weight gain (178 ± 4.93 g), and reduced feed conversion rate (0.8 ± 0.03 g) compared with the shrimp in the other groups. The shrimp treated with Bacillus sp. Mk22 also showed a lower Vibrio count (0.02 ± 0.01 × 102 CFU/ml) in the shrimp culture water compared with the other groups. The shrimp in the three groups were challenged with either Vibrio or WSSV. For the Vibrio infection, no mortality was observed from water infection or oral feeding infection in the commercial probiotic group and Mk 22 group. For the WSSV infection, a 68% survival rate from water infection and 20% survival rate from oral feeding infection was observed on day 45 in the Mk22 group, while 100% mortalities were recorded at a much earlier time in both the control and commercial probiotic groups. The antioxidant enzyme activities, indicators of oxidative stress, such as catalase and superoxide dismutase, significantly decreased in both the Vibrio and WSSV-infected Mk22 groups compared with the other groups, indicating that Bacillus sp. Mk22 was effective in reducing oxidative stress, possibly due to the reduced infection.
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