Abstract Three purple non-sulfur bacterial strains were enriched and isolated from the fish pond water and sediments in Hangzhou, they were named HZ-3,HZ-4,HZ-5 respectively. Among the three purple nonsulfer photosynthetic bacterias , the strain HZ-5 can purify the aquaculture water from fish pond and shrimp pond more efficiently . After 5 days treatment by the strain HZ-5, the COD of fish pond water was decreased by 24.87%; the COD of shrimp pond water was decreased by 36.99%; the Nitrite-Nitrogen of fish pond water was decomposed by 97.79%. The strain HZ-5 was identified as Rhodopseudomonas palustris according to its morphological characteristics, absorption spectrum scanning of live cell and physiological and biochemical properties, and the sequence analysis of 16S rDNA.
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