Abstract
Belawan River has many community activities such as residential areas, industries, Steam-electric power station, PDAM (local water company) and aquaculture. With this activity the waste is directly discharged into the river water, causing negative impacts on its aquatic environment such as nutrients (Nitrate and Phosphate) and water quality (Dissolved Oxygen) and the state of aquatic biota (Macrozoobenthos). One approach is to use the Purposive Random Sampling method with 5 stations. The approach was in the form of Macrozoobenthos measurement, namely; measurement of density, relative density, and attendance frequency. Measurement of nutrients, namely nitrate, phosphate and measurement of water quality, namely dissolved oxygen. The research results showed that Macrozoobenthos obtained as many as 9 genera. The highest Macrozoobenthos density in the genera of Polymesodaerosa was 629.62 ind/m2 at station 4, and the lowest was in the genera of Melanoides sp (Station 1), Macrobrachium sp and Melanoides sp (Station 2), Hirudo (Station 4), and Scylla sp (Station 5) with a density of 3.703 ind/m2. Based on nutrient nitrate concentration of 1.18-7.57 mg/l, it is included as mesotrophic and eutrophic waters, based on phosphate concentrations of 0.14-0.18 mg/l, it is included as hypertrophic, and dissolved oxygen of 3.8-5.3 mg/l is included as good water oxygen conditions.
Published Version
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