Monitoring the Ecotoxicology of the Koto Panjang Reservoir by Determining the Levels of Heavy Metals

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Water quality monitoring activities are important to be carried out regularly. This activity is intended as an effort to create sustainable cultivation activities. The Koto Panjang Reservoir is one of the reservoirs used for aquaculture activities, so monitoring activities at this location are important things to do. This activity was carried out using a survey method at two observation locations. Location 1 is the floating net caged area, and Location 2 is the upstream or non-floating net cages area. Direct water quality measurements were carried out in both locations: temperature, pH, and DO. In addition, water samples were taken to see the content of heavy metals, namely Cd and Pb. Water samples were carried out to see the heavy metal content at the Basic Chemistry Laboratory, Faculty of Engineering, Riau University. The results showed that overall, the physicochemical quality of water at the Koto Panjang Reservoir, both Locations 1 and 2, namely temperature, dissolved oxygen, and pH, still met the requirements for fish farming. While the value of Cd in all observation locations at the Koto Panjang Reservoir exceeds the quality standard, it can be said to be polluted. Unlike Cd, there is a difference in the value of Pb at Location I and II, namely Pb at Location I; the Pb value is outside the quality standard threshold or is said to be polluted, while Location II still has not exceeded the quality standard. The high Pb value at Location I was due to many fishing boat activities with engines.