Konbu Kombu Harvesting Regional Grades Japan
Hokkaido — Japan's primary kombu production region, Rishiri and Ma-kombu premier grades
Kombu (昆布, Saccharina japonica and related species) is Japan's most important dashi-making seaweed, and regional varieties produce distinctly different stocks. Ma-kombu (Hokkaido, richest glutamate — highest grade for dashi), Rausu-kombu (Hokkaido, strong, amber broth — for robust applications), Rishiri-kombu (Rishiri Island, clear, delicate — for refined kaiseki dashi), Hidaka-kombu (Hokkaido, softer, for eating as ingredient), Naga-kombu (long kelp, used for making kombu rolls). Each variety's glutamate content and flavor profile determines application. Kombu harvesting is regulated to protect sustainable populations.