Tuna has been an important fish species in Korea, contributing to the country's economic development as a popular export item. However, Korea's tuna longline fishery for sashimi has declined and been surpassed by Taiwan and China in the market. In contrast, Japan's production of farmed bluefin tuna has been increasing, solidifying its leading position in the industry, and there is potential for Japan to become a bluefin tuna exporter rather than an importer.