Water Quality Analysis of the Banjaran River Affected by Aquaculture Waste in Baturaden District

Abstract

Utilization of the Banjaran River for intensive aquaculture and livestock farming has necessitated urgent study, as uncontrolled waste discharge has caused continuous deterioration of water quality. This research aims to analyze the physical and chemical parameters of the water, the structure of plankton communities, and to formulate recommendations for responsible aquaculture management. Sampling was conducted in November 2025, measuring parameters such as temperature, pH, current velocity, dissolved oxygen, biochemical oxygen demand, and plankton density. The results revealed significant variations in water quality among locations. Dissolved oxygen levels were low (3.7–4.4 milligrams per liter), while biochemical oxygen demand was high (up to 6.3 milligrams per liter), particularly at stations receiving heavy organic loads. Plankton density peaked (172 individuals per liter) at stations with nutrient inputs, indicating a risk of excessive fertility. It was concluded that organic waste contributions have triggered pollution and eutrophication at several points in the river. Therefore, strict waste control and management efforts from aquaculture and livestock activities are urgently needed to ensure the ecological sustainability of the Banjaran River.