Isolation and Identification of Several Photosynthesis Bacteria and Their Application in the Culture of Tilapia sp / 微生物学通报

ABSTRACT

Five purple non-sulfur bacterial strains were isolated from the sediments of the rearing pond. According to the cultural, morphological, cellular spectra, physiological properties and inner intracytoplasmic membrane structures, strain AS-31 that was short rod and contained lamellar intracytoplasmic membrane was identified as Rhodopseudomonas palustris, and other four isolates (AS-32, DA-32, SY-32, and SY34) which were spheroid and contained vesicular intracytoplasmic membranes were identified as Rhodobacter spheroids. Pure cultures of strains AS-31 and SY-32 were used as additive in aquiculture of Tilapia sp.. After weeks of incubation, the weight and surviving percentage of experimental fishes increased about 20% than those of the control group without any additive. However, the mixed culture of strains AS-31 and SY32 have no obvious effect than that of the pure one. It demonstrated that the cultures of purple non-sulfur bacteria are of benefit to aquiculture and could be used as an additive.