Studies on Physico Chemical Parameters and Plankton Diversity in Litopenaeus Vannamei Culture Ponds in Nagapattinam Area, Tamilnadu

Author(s): R. Suresh* and B. Gunalan

Abstract: Due to over fishing, most of the wild fishery resources were over exploited. Aquaculture is very important for our future because our future generation more than 50% peoples will depend upon the cultured seafood’s for their protein source. In the present study, the plankton diversity and physico-chemical parameters analysis was done in aquaculture ponds in Nagapattinam area. For physico chemical parameters, the water samples were collected in plastic bottles and for plankton analysis the water samples were collected in plankton net was made up of bolting silk cloth no 30, mesh size 48 μm and preserved in 4% buffered formalin at regular intervals. pH and salinity measurement was done by using pH meter and hand refractometer. Totally 39 species of phytoplankton and 24 species of zooplankton were recorded. In summer crop, phytoplankton and zooplankton densities varied from 240-350x104cells ml-1, 70-330 cells 1-1 respectively, whereas in winter crop, phytoplankton and zooplankton densities varied from 60-103x104cells ml-1, 59-160 cells 1-1 m-2 respectively. pH value ranges from 7.80 to 8.48 during summer crop and 7.50 to 8.32 during winter season. Salinity was recorded 30 to 40ppt in summer and 15 to 30ppt in winter. The mean value of nitrate concentration was 0.182ppm. From the results it is concluded, there is a significant variation in plankton diversity and abundance between summer and winter culture.

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