In Japan, the residue left after consuming seafood is properly processed by the private sector. Over 70% of fish scraps in Japan and 100% of oyster shells in Hiroshima Prefecture are collected and reused. While the main uses of fish scraps are fish oil and fish meal, they are also used for various purposes such as food and medicine. Similarly, seashells are used not only as soil conditioners and construction materials, but also in supplements, chicken feed, and aquaculture materials. Japan's self-sustaining recycling of seafood processing residues should be promoted to the world.

In Shakotan Town, Hokkaido, we have begun creating seaweed beds to ensure stable production and supply of sea urchins, the town's main industry. The recycling-oriented system using sea urchin shell fertilizer has produced a variety of effects, and carbon offsetting has also been achieved through the blue carbon function of the created seaweed beds. This paper introduces a regional revitalization project through "Umi-gyo," or marine industry, that creates vibrancy in fishing villages centered on the creation of marine forests and a business model for revitalizing fisheries and fishing villages.

As global warming and changes in marine environments increasingly threaten the sustainable use of fisheries resources, land-based salmon farming using recirculating aquaculture systems (RAS) has attracted attention as an environmentally sustainable food production model. This paper reviews recent developments and challenges in land-based aquaculture in Japan, with a particular focus on the Kitakyushu region, based on the perspective that terrestrial ecosystems, including forests and satoyama landscapes, play a vital role in supporting marine environments. It further explores the potential of a circular production model integrating regional resources such as renewable energy and abandoned bamboo forests. Finally, the paper proposes a new vision of ocean governance that seeks to protect and sustain marine environments through land-based initiatives centered on salmon aquaculture.