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### Model Project for Improving Water Environments in Enclosed Seas - April 2007 to 2020s A model project to improve water environments in enclosed seas commenced in 2007, targeting the Sendai Bay, Osaka Bay, and Harimanada areas in Miyagi, Osaka, and Hyogo Prefectures. It introduced technologies to reduce aquaculture wastewater and suppress nitrogen and phosphorus emissions, improving coastal oxygen deficiency. By the 2010s, the scope of technology application expanded: Sendai Bay achieved a 15% reduction in nitrogen emissions; Osaka Bay saw biodiversity increase by over 20% due to expanded seagrass beds; and Harimanada Bay progressed with improved water transparency and revitalized tourism. By the 2020s, Miyagi Prefecture reduced nitrogen and phosphorus emissions by 25%, Osaka Prefecture saw a 10% increase in bay fisheries catch, and Hyogo Prefecture expanded its vegetated zones to 300 hectares. These projects are gaining attention as initiatives that successfully balance r
egional economic revitalization with environmental conservation.