Seyede Parvin Moussavi - Environmental Health Research Center, International Branch of Shahid Sadoughi University of Medical Sciences and Health Services, Yazd, Iran
Naghmeh Ashena - Chemical Engineering Department, Amir Kabir University of Technology, Tehran, Iran
Mohammad Mahdi Soori - Department of Environmental Health Engineering, School of Health, Jiroft University of Medical Sciences, Jiroft, Iran
Milad Mousazadeh - Student Research Committee, Qazvin University of Medical Sciences, Qazvin, Iran
Reza Ghanbari - Social Determinants of Health Research Center, Qazvin University of Medical Sciences, Qazvin, Iran۶Department of Environmental Health Engineering, School of Health, Qazvin University of Medical Sciences, Qazvin, Iran
Reza Rostami - Student Research Committee, Kermanshah University of Medical Sciences, Kermanshah, Iran

Background: Cyanobacteria are the most important group of algae. Many factors are involved in the rapid growth of algae such asphosphorus and nitrogen contents.Objectives: The current study aimed at evaluating the effect different phosphorus concentrations on the growth rate of Cylindrospermopsisraciborskii during the aquatic life.Methods: The experiment was carried out for ۱۲ days at three phosphorus concentrations and one control group in Zehnder ۸ andBlue-Green ۱۱ media. The rates of cell division per day (G) and specific growth rate ( ) were separately estimated for each group.Cyanobacterium was tested at three phosphorus concentrations; ۱۵۰, ۳۰۰, and ۶۰۰ g/L.Results: The current study results showed that increasing phosphorus concentration had a significant effect on the growth of C.raciborskii in some particular days of cultivation. The maximum growth rate (۰.۹ per day) was observed at ۷ g/L phosphorus concentration.Conclusions: Phosphorus was a limiting factor and contributed to the removal of toxins from the alga and its blooming. The maximumgrowth rate was observed in the group treated on the day ۸ of cultivation with phosphorus concentration of ۳۰۰ g/L.

Cyanobacteria, Cylindrospermopsis raciborskii, Phosphorus, Growth Rate