Study on aquaculture suitability index to improve seaweed farming efficiency-case study on Lombok Island Indonesia
2023
Yoshida, Y. | Saville, R. | Hatanaka, K. | Shimoguchi, N. | Moruoka, A. | Wada, M.
Due to its high demand as a processing material for food and cosmetics, seaweed is an essential agricultural product in Indonesia, the world's second-largest producing country after China. However, the Indonesian government stated that seaweed cultivation in Indonesia still needs to utilize the coastal areas effectively. In addition, yields vary depending on the location and season of cultivation. Through a case study approach in Seriwe village, Lambok Indonesia, authors propose a suitability index for seaweed cultivation to spatially understand the suitability of seaweed of seaweed cultivation based on season, location and optimal yield. Multiple regression analysis was conducted to understand the suitability index of seaweed aquaculture, and a production function was examined. Assuming that the environment influences seaweed yield, and independent variables were water temperature, water depth and inflow as environmental factors of the breeding farm, while the dependent variables was seaweed yield. Water temperatures were obtained using Landsat8 satellite images provided by the United States Geological Survey and calibrated using water quality sensor data from the study area. Water depth was obtained using GeoTIFF data from a digital elevation model provided by the Indonesian Geospatial Agency. Obtained from an ocean prediction model called NAOTIDE, inflow was used as the boundary condition. Multiple regression analysis and ArcGIS Pro mapping revealed that the suitable area index for seaweed cultivation was higher in areas close to land and with shallow water depths than in areas close to the outer bay. Moreover, it was also revealed that productivity was higher in the rainy season than in the dry season.
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