Deposition of suspended sediment was measured with sediment traps in shallow coastal waters colonized by Thallasia dominated seagrass in Pannikiang Island, South Sulawesi (Indonesia). The primary objective of this study was to compare the amounts of sediment deposition inside seagrass beds and in adjacent unvegetated area. The traps were placed in a seagrass bed (Station I, II, and III) and in an adjacent unvegetated area (Station IV) measuring the sediment flux on the seabed. The sediment fluxes due to deposition were significantly higher at stations I and II (P < 0.05) and station III (P < 0.01) than at station IV (unvegetated area). Results of this study suggest that sediment deposition was promoted by dense shoots of seagrass. The study provides quantitative evidence for the importance of seagrass bed as sites of sedimentation of fine particles.

The life of coastal communities is always associated with water. Anafre River estuary is one of the river estuaries that empties directly into the Gulf of Yos Sudarso. The amount of particles swept away and buried in estuary sedimentation Anafre inflicts not only the river but the Gulf of Yos Sudarso. Declining water quality of the Gulf of Yos Sudarso is caused by the influx of water from the Anafre River, whereas all Anafre River watersheds are located in close proximity to residential areas. This study aims to determine the level of public knowledge on the effects of sedimentation and community based management. Data are collected by field observations and interviews with the community, and analyzed using the qualitative descriptive method. The results showed that the community plays an active role in the maintenance and utilization of the Yos Sudarso area, because the gulf of Yos Sudarso serves as transportation routes, tourist areas, and workplaces (fishermen). The maintenance of water environment in river estuaries and the gulf is based on the principles of awareness and cooperation without ignoring the people's culture.

Silvofishery is a concept that was developed as a form of sustainable fisheries cultivation with low inputs. The basic principle of this cultivation is the plural or dual use of mangroves without losing their natural ecosystem function. Various marine biota can be cultivated using silvofishery patterns, one of which is the mangrove crab. This study examines the water quality for the development of silvofishery-style mud crab cultivation in Polewali Mandar Regency, West Sulawesi Province. The method used is a survey method to obtain water quality data. Sampling was carried out at four research stations, namely Campalagian, Wonomulyo, Mapilli, and Binuang, measuring directly in the field and analyzing water quality at the Fisheries Cultivation Laboratory Pangkep State Agricultural Polytechnic, South Sulawesi. The results showed that the water quality parameters of the coastal area of Polewali Mandar Regency were entirely suitable for silvofishery mud crab cultivation.

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