University of Guilan Aquatic Physiology and Biotechnology 2345-3966 8 2 2020 09 15 Exploring the process of phytoplankton population changes in relationship to physical and chemical factors in Gomishan shrimp ponds, southeast of the Caspian Sea Exploring the process of phytoplankton population changes in relationship to physical and chemical factors in Gomishan shrimp ponds, southeast of the Caspian Sea 133 158 4271 10.22124/japb.2020.13078.1327 FA Arezoo Naemi M.Sc. Student in Fisheries, Faculty of Agricultural Sciences and Natural Resources, Gonbad Kavoos University, Gonbad Kavoos, Iran Rahman Patimar Associate Professor in Department of Fisheries, Faculty of Agricultural Sciences and Natural Resources, Gonbad Kavoos University, Gonbad Kavoos, Iran Mohammad Harsij Assistant Professor in Department of Basic Sciences, Faculty of Agricultural Sciences and Natural Resources, Gonbad Kavoos University, Gonbad Kavoos, Iran Saeed Yelghi Assistant Professor in Inland Waters Aquatic Stocks Research Center, Gorgan, Iran Journal Article 2019 04 24 This study was conducted to evaluate water quality impacts on phytoplankton community and nutritional status of the Gomishan shrimp ponds. During the breeding season (May-October 2016), water was sampled using one-liter dark bottles from 6 ponds and in each pond, three stations, near the entrance, the middle and near the outlet. At the sampling site, some physical and chemical factors of water were measured and recorded, including: temperature, salinity, pH, dissolved oxygen (DO), turbidity and EC. Water Samples were transferred to the laboratory for measuring nitrate and phosphate, as well as the identification and counting of phytoplankton. Total of 23 genus belonging to 6 phylum recorded for the ponds. Bacilloriophyta and Dinophyta phylums dominated the phytoplankton community in June. There was a significant difference in phytoplankton phylum abundance among months of study period (p < 0.05). The results showed that all recorded environmental factors were in an optimal range, while DO and salinity variations were considerable. Pearsons test analysis revealed that there is significant correlation between phytoplankton abundant and environmental factors in the study period. This study was conducted to evaluate water quality impacts on phytoplankton community and nutritional status of the Gomishan shrimp ponds. During the breeding season (May-October 2016), water was sampled using one-liter dark bottles from 6 ponds and in each pond, three stations, near the entrance, the middle and near the outlet. At the sampling site, some physical and chemical factors of water were measured and recorded, including: temperature, salinity, pH, dissolved oxygen (DO), turbidity and EC. Water Samples were transferred to the laboratory for measuring nitrate and phosphate, as well as the identification and counting of phytoplankton. Total of 23 genus belonging to 6 phylum recorded for the ponds. Bacilloriophyta and Dinophyta phylums dominated the phytoplankton community in June. There was a significant difference in phytoplankton phylum abundance among months of study period (p < 0.05). The results showed that all recorded environmental factors were in an optimal range, while DO and salinity variations were considerable. Pearsons test analysis revealed that there is significant correlation between phytoplankton abundant and environmental factors in the study period. https://japb.guilan.ac.ir/article_4271_e5ffedca6880df51f9977f0130a864b9.pdf