Bathymetry and substrate characteristics in Pulo Suwalan coral reef areas for fish apartment development in Rembang coastal area

This study aims to analyze the characteristics of the bathymetry and bottom substrate in the Pulo Suwalan coral reef area for fish apartment development. The research location was carried out in the coral reef area of Pulo Suwalan in the coastal area of Rembang Regency. This research used a survey method. The study research showed that the Pulo Suwalan coral reef area was in the shallow water zone. The depth of the waters at the study site ranges from 0.5-8 m. The bottom morphology of the waters is flat to almost flat. It is known that 81.25% of the bottom substrate in the site location is silt and 18.75% is sand-smooth. The Pulo Suwalan coral reef area has the potential to become a location for installing fish apartments based on the degradation of the environment and the depth of water.