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Page No.: 7-13 Volume: 15, Issue 1, 2020 ISSN: 1817-3381 Journal of Fisheries International Copy Right: Medwell Publcations Abstract: Physico-chemical parameter and plankton such as phyto and zooplankton have been studied in selected two ponds in Dumkiupazila in Patuakhali district. Physico-chemical parameter plays a vital role in aquatic community. Their growth and productivity rate directly affected by those parameters. Phyto and Zooplankton that constitute an important food supplier of many omnivorous and carnivorous fishes. Moreover, it has a great impacts to control biological activity, oxidation and organic compounds. The study was carried out both culture and non-culture aquatic resource. There are about 4 groups of zooplankton where Copepoda (40.08%), Maxillopoda (38.83%), Malacostraca (16.29%), Branchiopoda (4.8%) and 10 groups of phytoplanktonwere identified where Bacillariophyceae (29.65%), Euglenophyceae (1.34%), Spirotrichea (2.20%), Cyanophyceae (25.88%), Surirellaceae (0.74%), Chlorophyceae (1.13%), Zygnematophyceae (3.30%), Ulotrichaceae (10.85%), Ulvophyceae (24.88%). Nauplius (38.83%) are the most abundant among all Zooplankton and Fragillaria (22.02%) are most among all phytoplankton. Physico-chemical parameters has a great impacts on plankton abundance. Some physico-chemical parameters such as: temperature, transparency, dissolved oxygen, pH, alkalinity, hardness, nitrate, ammonia were observed monthly. Mean values of water temperature (°C), transparency (cm), dissolved oxygen (mg LG), pH, alkalinity, hardness, nitrate (mg LG) and ammonia (mg LG) were 29.35±1.68, 36.71±3.8, 4.90±1.7, 7.19±0.7, 95.14±17. 19, 10.72±2.27, 0. 16±0.08, respectively. Water temperature, ammonia, pH and phosphorus were optimum range in the investigation time. But the concentration of nitrate was so,

Phytoplankton Zooplankton Interrelationship between Two Ponds and Effect of Seasonal Fluctuations on their Abundance