For years giant jellyfish have swarmed the Sea of Japan. But at up to seven feet in diameter and some weighing over 600 pounds, they have become a threat to the fishing industry.
Last month, the jellyfish sank a 10 ton fishing trawler when they got snagged in the boat's net.
This year there are more than ever and they are extending their drift to around the country.
"I had never seen anything this big before," said a local fisherman.
The jellyfish are poisoning the fishermen's catch.