Vol. 7, Issue 12, Part A (2025)

The water and soil samples were collected from the five (adjacent coastal waters – S3, S4, S5) selected stations and the sediment samples were collected only in station 1 and 2 (Shrimp ponds). The collected water samples were analysed for their various physico-chemical parameters such as water depth, light extinction coefficient (k), surface water temperature, total suspended solids, total dissolved solids, salinity, dissolved oxygen, Biochemical Oxygen Demand, Chemical Oxygen Demand, nitrite, nitrate, phosphate, ammonia and chlorophyll-a. The collected sediment samples were analyzed for organic carbon, total nitrogen and C / N ratio. In the present study, in all the stations the recorded overall values of physical parameters such as depth, light extinction co-efficient (k), surface water temperature, salinity, total suspended solids and total dissolved solids ranged from 1.0 to 1.7 m, 1.05 to 6.52, 24.5 to 32ºC, 34.0 to 38.0 ppt, 0.22 to 7.7 mg/l and 38.22 to 59.5 mg/l respectively. The observed range of overall values of chemical parameters such as dissolved oxygen, BOD, COD, nitrite, nitrate, phosphate and ammonia were 3.15 to 6.70 ml/l, 0.55 to 5.1 mg/l, 2.2 to 20.5 mg/l, 0.17 to3.82 µg.at.NO₂-N/l, 0.01 to 1.12 µg.at.NO₃-N/l, 0.82 to 5.36 µg.at.PO₄-P/l and 0.01 to 4.8 µg.at.NH₃-N/l respectively. The values of C: N ratio varied from 1.43 to 5.41 in station 1 and from 0.07 to 11.16 in station 2. Among biological parameters, the values of chlorophyll-a content ranged from 1.15 to 310.66 mg/m³ in all the stations.