THE IMPACT OF FLOATING NET CAGE ACTIVITIES ON THE WATER QUALITY OF CENGKLIK RESERVOIR: ANALYSIS OF BOD, COD, DO, AND TSS FROM SECONDARY DATA
DOI:
https://doi.org/10.18623/rvd.v23.6156Keywords:
Floating Net Cage, Water Quality, Cengklik ReservoirAbstract
Cengklik Reservoir in Boyolali, Central Java, has experienced significant water quality degradation due to intensive Floating Net Cage (FNC) activities. Uneaten feed and fish feces that accumulate at the reservoir bottom increase organic matter and nutrient loads, leading to eutrophication and upwelling phenomena that cause mass fish mortality. This study aims to analyze the impact of FNC activities on water quality through Biochemical Oxygen Demand (BOD), Chemical Oxygen Demand (COD), Dissolved Oxygen (DO), and Total Suspended Solids (TSS). Secondary data were obtained from the Bengawan Solo River Basin Authority (BBWS) covering the period 2020–2024, tested using SNI 6989.72:2009, SNI 6989.2:2019, APHA (2017), and an in-house method for TSS. Descriptive analysis was employed to evaluate annual trends and compare them against national standards (Government Regulation No. 22/2021). The results indicate that BOD (3.41–7.9 mg/L) and COD averages consistently exceeded quality thresholds, while DO remain relatively low (<4 mg/L), signaling unhealthy aquatic conditions. TSS values fluctuated but generally stayed below the standard limit. In conclusion, FNC activities significantly contribute to the deterioration of reservoir water quality. The study implies the urgent need for improved feed management, cage density regulation, continuous monitoring, and stakeholder collaboration to sustain both ecological functions and the socio-economic benefits of Cengklik Reservoir.
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