FIELD: medicine.
SUBSTANCE: group of inventions refers to biotechnology and microbiology. There are presented strain Bacillus sp. KCCM11143P possessing antifungal activity on Saprolegnia sp., culture fluid produced by culturing the strain, probiotic composition, feed additive, antifungal agent and agent for improving quality of water containing the strain Bacillus sp. KCCM11143P or its culture fluid. There are also presented method for culturing fish or shell fish, method for preventing saprolegniosis in animals and method for improving quality of water with using the strain Bacillus sp. KCCM11143P or its culture fluid.
EFFECT: strain Bacillus sp KCCM11143P has a high production level of siderophores inhibiting a high ability of iron uptake and thereby inhibits the growth of other pathogens and Saprolegnia sp, promotes a higher rate of food consumption and weight gain by fish, as well as reducing an excretion level that promotes higher quality of water.
10 cl, 4 dwg, 11 tbl, 15 ex
