Batam Island has abundant natural resources in the sea area. This is due to the fact that Batam Island is surrounded by the ocean. However, the potential of this great natural resource has not been fully exploited by people on Batam Island, especially by the fishermen. This is due to the lack of information regarding the distribution value of chlorophyll-a which is required to determine the potential location of various biodiversity in piayu waters. The aim of this study was therefore to determine the distribution of chlorophyll-a in Piayu waters. The data processing method used was the extraction of Terra Modis image data using Ocean Data View (ODV) software. From this research, a map of the distribution of chlorophyll-a in Piayu waters was produced. The results showed that the highest distribution of chlorophyll-a occurred in May 2019 with a chlorophyll value of 2,462 mg/m3. The lowest distribution of chlorophyll-a in this study was in December 2018 with a value of 1,612 mg/m3. The content of chlorophyll-a is more abundant in the surface layer near the mainland waters of Piayu, Batam, while the closer it is to the sea, the lower the chlorophyll-a content.

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