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Impact Identification of Estuarine Water Quality to Marine Biota: A Case Study in Wonorejo Estuary, Indonesia

Marine pollution in Wonorejo estuary has been a concern. Partly, marine pollution is carried by the river and the effluent from fish ponds. The amount of fish harvesting for fishermen and fish ponds farmers, especially shrimp ponds decreases time by time. The aim of this study is to know water quality parameters that have exceeded from the quality standard criteria from field work and their impacts to marine biota. Sampling of water quality took place at ten stations along river up to open sea with three points of depth to find out the concentration of ammonia, phosphate, BOD, DO, and phenol. The average concentrations of water quality parameters, 0.6 mg/L for ammonia, 0.09 mg/L for phosphate, 6.8 mg/L for BOD, 5.51 mg/L for DO, and 0.0451 mg/L for phenol, respectively. High concentration of phenol can cause a death for some marine biota.