Woodblock print of fishermen amongst reed beds. Image thanks🙇♂️- https://ukiyo-e.org, https://harashobo.com, and https://adachi-hanga.com.
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Until the early Edo period villagers had harvested naturally growing algae by hand (in the 8thC it is recorded that some fishermen paid their taxes to the emperor in kelp), but farming allowed for cheaper and more readily available seaweed (a valuable food source in winter).
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