Diversity, density and frequency of crustacean zooplankton community at warm water fishes ponds at East of Golestan Province, Gonbade Kavous city

The aim of this study was estimate of diversity, density and frequency of crustacean zooplankton community of warm water fish ponds in Gonbade Kavous city at east of Golestan province. Sampling act was done during one culture period from June to November 2011. Finally 7 genuses were identify and recorded during study period. So that 4 genuses belongs to copepoda and 3 genuses belongs to cladocera. From statistical aspect, there is no significant differences between different 6 ponds observed (P>0.05). But there is significant differences between different months observed (P<0.05). So that, the highest density belongs to June and July months and lowest density belong to September and November months. The results show that the highest and lowest frequency percent of dominance genus belongs to Eucyclops sp, Cyclops sp, Daphnia sp, Diaphanosoma sp, Nauplius, Chydorus sp and Thermocyclops sp with 53, 16.5, 12, 11, 5.5, 1.5 and 0.5 % respectively. The correlation analysis between crustacean zooplankton community and water physico-chemical parameters show that total density of crustacean zooplankton community had significant correlation with NO3, PO4 and P-PO4 parameters -0.891, 0.939 and 0.968 respectively. Other water physico-chemical parameters had no correlation relative with crustacean community. The results show that crustacean of zooplankton community of fish ponds affected by ecosystem management, climate condition, water physico-chemical parameters and grower fishes.