期刊
JOURNAL OF BIOSCIENCE AND BIOENGINEERING
卷 106, 期 5, 页码 419-424出版社
SOC BIOSCIENCE BIOENGINEERING JAPAN
DOI: 10.1263/jbb.106.419
关键词
Psidium guajava; Aeromonas hydrophila; motile Aeromonas septicemia; antimicrobial activity; tilapia
Fourteen herbs were extracted in water, 95% ethanol, and ether, and tested in vitro for antimicrobial activities against Aeromonas hydrophila, a fish pathogen causing motile Aeromonas septicemia. Using swab paper disc assays and minimal inhibitory concentration (MIC) determinations, we noted that the ethanol extract of Psidium guajava leaf exhibited the strongest antimicrobial activity. The extract allowed growth-inhibited A. hydrophila cells to regrow in fresh BHI broth indicating a bacteriostatic mode of action. In a pathogenicity test, the median lethal dose (LD50) of A. hydrophila for tilapia (Oreochromis niloticus) by intraperitoneal injection was 3.44x10(6) CFU/ml. In vivo experiments showed that fish diets containing either dry leaf powder of P guajava or dried ethanol extract of P guajava leaf reduced mortality of A. hydrophila infected tilapia with no detected adverse effect on the fish. This study suggests that P guajava leaf has the potential to control fish diseases caused by A. hydrophila.
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