STUDY OF WATER QUALITY AND SEDIMENT PURIFICATION BY NITRIFYING BACTERIA IN A CALIFORNIA PERCH (MICROPTERUS SALMOIDES) POND

The purpose of this research was to study the effect of probiotic nitrifying bacteria on the water quality of California perch (Micropterus salmoides) ponds. Water quality indexes, including the transparency, potential hydrogen (pH), ammonia nitrogen (NH4⁺-N), nitrite, total nitrogen (TN), total phosphorus (TP), sediment organics, sediment nitrogen, sediment phosphorus and amount of plankton, were detected to evaluate water quality. The results showed that the nitrifying bacteria could stabilize pH and reduce the contents of nitrite and TN; additionally, the maximum TN removal rate was 72.5%, the maximum sediment organics removal rate was 54.0%, and the maximum sediment phosphorus removal rate was 50.0%. The total amount of plankton in the early stage of the nitrifying bacteria treatment was higher than that of the control pond, and the total amount of plankton in the later stage was lower than that of the control pond.