The impact of floating net cages on the water quality of riam kanan reservoir, south kalimantan

Abstract

Reservoirs in Indonesia have been widely used as floating net cages, including in the Riam Kanan Reservoir. The use of the reservoir as a floating net cage has affected the quality of water in the reservoir. The purpose of this study was to analyze the physical and chemical quality of water in the Riam Kanan reservoir due to floating net cages cultivation activities. This study used a purposive random sampling method, with the sampling location determined based on the density of floating net cage cultivation with a total of 8 points and a depth of 2 m, 6 m, and 8 m, respectively. The physical value of water was obtained by direct measurement and the chemical value of water is obtained from the measurement results in the laboratory. The data analysis in this research was the descriptive analysis where the data were obtained from the tables and graphs. The results of the research on the physical-chemical quality of water in the Riam Kanan Reservoir show that the physical values of water such as temperature, smell, taste, and color in the waters of the Riam Kanan Reservoir were still within the normal condition. The value of pH has a value of about 7.18-7.76. The value of Dissolved Oxygen (DO) was about 3.76 mg/l-6.14 mg/l. Nitrate value is about 0.002 mg/l-0.4099 mg/l. The nitrite value was about 0.0012 mg/l-0.0034 mg/l. Ammonia content was about 0.1643 mg/l-0.5132 mg/l. The levels of pH, DO, nitrate, and nitrate were a normal category, but the ammonia level was in the dangerous category. The chemical content increased with the depth of the water, due to the influence of the used feed deposited.