Underwater Fertilizer Made With Sea Urchin Shells Reproduces Kelp Forest, Sea Urchin Resource
Sea urchin roe is a popular delicacy. Shakotan, a small fishing town in western Hokkaido with a population of 1,883, produced 20 tons of high-grade sea urchin roe in FY2019. It also produces 100 tons of sea urchin shells, which is industrial waste, and fishers had to address its dispositions. The town developed unique underwater fertilizer using dried sea urchin shells. Its application to deserted rocky shores successfully reproduced kelp forest. Sea urchins returned there to feed on the kelp and produced high-quality roe...
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