The survey was conducted in July 2021 in the waters of the Sikakap Strait in the Mentawai Islands District, West Sumatra Province. The purpose was to analyze the organic matter content of sediments and macrozoobenthos organisms. This study also needs to monitor the relationship between the organic matter content in sediments and the abundance of macrozoobenthos. Samples were collected from a 5-point station consisting of 3 substations. Repeat three times at low tide to sample directly. The parameters measured in this study were brightness, water temperature, salinity, current velocity, and pH. The results of this study indicated that the environmental conditions of Sikakap Strait are still able to support macrozoobenthos life. Up to 15 species of the macrozoobenthos were found, consisting of two strains, the Mollusca and Oligochaetes. There were two classes in the phylum of Mollusca 6 species of bivalves and gastropods, 8 and 1 species of phylum class Oligochaete tubificidae. The diversity index (H’) was low, and the number of individuals was not uniform. The dominance index (D) is close to 1, meaning that a specific type or species dominates the community. The relationship with the organic matter content in the waters showed weak and positive sense if the organic material increases, the abundance also increases.
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