Group 1 - The article highlights the significant impact of the recent extreme heat on South Korea's economy and fisheries, leading to increased prices for various seafood products [1][11] - The price of flounder in Seoul's largest seafood wholesale market has risen to 40,000 KRW (approximately 206 RMB) per kilogram, marking an increase of over 30% compared to the same period last year [3] - The average retail price of mackerel in South Korea has also surged to approximately 26 RMB, reflecting a similar increase of over 30% year-on-year [7] Group 2 - The average water temperature in South Korea's surrounding seas reached 24.6 degrees Celsius in July, the highest level in nearly a decade, prompting high-temperature warnings in over 40% of the country's waters [11] - Over 180,000 farmed fish have died due to high temperatures since the first report of mass mortality was received at the end of last month [11] - To mitigate losses, local authorities are releasing millions of farmed fish into the sea and implementing measures such as vaccination and oxygen supply systems in aquaculture facilities [13]