South Korea's oyster fishing season in October has been impacted by high temperatures, leading to a significant die-off of oysters and heavy losses for farmers. The water temperature rise has also reduced the size of surviving oysters and increased the mortality rate of young oysters, with the aquaculture industry facing a crisis. High sea water temperatures have also caused the death of 49.23 million farmed fish, an increase of 55% over last year. In response, large South Korean supermarket chains have started importing Chinese mussels, abalones, and clams to make up for the shortage.