Journal of Life Science (생명과학회지)

Korean Society of Life Science (한국생명과학회)
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Soybeans Fermented with Bacillus po/yfermenticus KJS-2 Protects Oplegnathus fasciatus from Iridovirus and Pathogenic Bacterial Infection

Bacillus polyfermenticus KJS-2에서 발효된 콩의 돌돔에 대한 이리도바이러스 및 병원성균에 대한 예방효과

  • Published : 2009.06.30
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Abstract

Lyophilized powder (BP2FS) of soybeans fermented with Bacillus polyfermenticus KJS-2 (B. polyfermenticus KJS-2) exhibited in vitro antibacterial activities against eight pathogenic bacteria. BP2FS was used as a fodder additive for Oplegnathus fasciatus (0. fasciatus) culture. One group (UFD) of O. fasciatus was fed a commercial fodder, while another group (FD) was fed the same fodder, but including BP2FS ($6{\times}10^{4}$ cfu $g^{-1}$ fodder), two times daily for 120 days. The mean body weight of the FD group (67.29${\pm}$12.62 g) was higher than that of the UFD group (56.56${\pm}$8.21 g) after 120 days. The survival rate of FD was 80% compared to 40% for the UFD group. Cumulative mortalities in the FD and UFD groups were 18.95% and 60.98% respectively. B. polyfermenticus KJS-2 was isolated from the intestines of the FD group and the number of viable colonies was estimated to be $1.04{\times}10^{4}$ cfu $g^{-1}$. Iridovirus and Vibrio vulnificus was detected in the organs of the UFD group but not in the FD group. All of the infected fish showed typical clinical symptoms of hemorrhage in their tail fins. Dissection of the infected internal organs revealed liver congestion and spleen enlargement - typical symptoms caused by iridovirus infection. These results clearly show that BP2FS is highly beneficial in preventing O. fasciatus from iridovirus infection.

Bacillus polyfermenticus KJS-2 (B. polyfermenticus KJS-2)를 이용하여 발효된 콩(BP2FS)은 8가지의 병원성균에 대해 항균활성을 가졌다. BP2FS는 돌돔의 배양에 있어 사료첨가제로 사용되었다. 돌돔의 배양시 BP2FS를 투여한 군($6{\times}10^{4}$ cfu $g^{-1}$ 사료)과 투여하지 않은 군으로 나누었으며, 투여한 군은 120일 동안 하루에 두 번씩 투여 하였다. 120일 후에 투여한 군의 돌돔의 몸무게는 67.29${\pm}$12.62 g이었으며 그렇지 않은 군의 몸무게는 56.56${\pm}$8.21 g으로 나타났다. 생존율은 투여한 군(80%)과 투여하지 않은 군(40%)이었다. 폐사한 돌돔의 축적된 양은 투여한 군(18.95%)과 투여하지 않은 군(60.98%)이었다. BP2FS를 투여한 군에서 B. polyfermenticus KJS-2를 돌돔의 장내에서 검출한 결과 $1.04{\times}10^{4}$ cfu $g^{-1}$으로 나타났다. BP2FS를 투여 하지 않은 군의 돌돔에서는 iridovirus에 감염되었을 경우 나타나는 전형적인 증상인 비장과 간에서 비대세포가 관찰 되었다. 이 결과들은 BP2FS는 돌돔의 이리도바이러스에 대한 감염 시 예방효과를 가져온다 할 수 있다.

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References

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