Biological control of cyanobacterial bloom in fish Culture ponds using Pseudomonas putida

Cyanobacterial blooms cause huge and irreparable financial losses to fish farmers every year. One of the most effective methods for managing water cyanobacterial bloom is biological control by adding pathogenic agents to break down cyanobacterial cells. Therefore, this study investigated the possibility of using Pseudomonas putida bacteria to control the bloom of cyanobacteria Chroococcus sp., Oscillatoria sp., Microcystis sp. and Gloeocapsa sp., isolated from fish Culture ponds was done in the laboratory. The results of this study showed that Pseudomonas putida bacteria have a significant effect on controlling all 4 cyanobacterial species. So, for the cyanobacterium Chroococcus sp. In the experimental group containing 106 CFU/ml of Pseudomonas putida bacteria, there was a moderate 80.7% reduction and also in the group containing 104 CFU/ml of this bacterium, there was 63.1% reduction compared to the control group models on the 10th day. Also, for the cyanobacterium Oscillatoria sp. at the 10th day, 78.9% reduction occurred in 104 CFU/ml and 87.7% in 106 CFU/ml. Next, for the cyanobacterium Microcystis sp. On the tenth day, there was 61.7 percent decrease in the group containing 104 CFU/ml and 70.5 percent decrease in the group containing 106 CFU/ml of Pseudomonas putida bacteria. Finally for the cyanobacterium Gloeocapsa sp. A decrease of 72.3% was observed in the experimental group containing 104 CFU/ml and an 83% decrease in the group containing 106 CFU/ml. Although the control group show an increase of 37-78 percent (P˂0.05). The results of this research showed that the bacterium Pseudomonas putida has a high efficiency in controlling the bloom of cyanobacteria.