The Ministry of Oceans and Fisheries in South Korea has issued a caution level special alert for Nomura jellyfish in Jeju waters due to the high number of these toxic jellyfish spotted in all areas. This is the largest scale since 2013, with 1 to 5 individuals per 100 m2. The jellyfish are expected to appear in large numbers along the South Sea and East Sea coasts from early to mid-July. The warning level is issued to prevent damage to fisheries and stinging accidents for beach bathers, and the ministry plans to strengthen the surveillance system and take measures to remove the jellyfish.