Since August, the Jeju and west coast had shown little variability in water temperature with 22-30℃ YoY, but the water temperature in south and east coast fluctuated; very high temperature from early July to early August with 18-27℃ YoY, but from mid August to late September with water temperature 2-4℃ lower than last year. 

The southern sea areas experienced red tide damages for the first time in six years due to the record intensive downpour by the frequent growth of a stationary front and the impacts of the steady southerly wind coupled with the North Pacific High, causing increased nutrients, a decrease in the number of competitor species, the formation of water temperatures just right for the growth of red tide organisms (24-27℃) and cold watermass.

The impacts of abnormal climate applied to the emergence of Nomura’s Jellyfish (Nemopilema nomurai). The low water temperature across East Asia including Korean waters slowed the occurrence and growth of jellyfish, reducing the damages to fishing activities and holiday goers by 44% YoY. 

In case of HWT of this year, the damages to aquaculture organisms decreased by approximately 13% YoY coupled with a slowdown in the increase of water temperature in the coasts of the East and South seas and preemptive actions such as early harvest to mitigate the damages, urgent release, etc.