In 2005, the Japanese archipelago suffered from a never-before-seen outbreak of the giant jellyfish (Nemopilema nomurai) causing serious damage to the fisheries industry.The outbreaks have become often recently.To assure sustainability of the East Asian Marginal Seas, which is one of the most productive fisheries grounds, China, Japan and South Korea have to make a concerted effort to deal with the jellyfish.
Selected Papers No.9(p.6)

The giant jellyfish has massively invaded Japan's coasts in recent years and has caused extensive damage to coastal and offshore fisheries.In cooperation with the Fisheries Research Agency, fisheries associations, prefectural governments, and universities, the Fisheries Agency has carried out various measures including mapping the distribution of the jellyfish and developing the devices to prevent bycatch of and to reduce troubles by the jellyfish during fishing operations.For reducing the damage to the fisheries and stabilizing the fisheries management, we intend to take more effective measures at the early stages of the jellyfish appearance through cooperation with China, and Korea as well as the steady implementation of previous measures.

In 2005, Japan's surrounding sea areas have been inundated with giant jellyfish and it has caused extensive damage to Japan's fisheries industry.Fisheries Research Agency is conducting research on giant jellyfish countermeasures and is working to translate the results that have been achieved such as the prediction of its invasion and the upgrading of fishing equipment into concrete activities.