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That's it, add Japan to the list of places we are never going swimming -- Australia (crocodiles and sharks) and Loch Ness (Nessie -- can't be too sure) if you must know.

Not only do you have to keep an eye out for sumo wrestlers in speedos, but also swarms of sumo wrestler-sized jellyfish which are currently invading their waters.

The monsters, which can grow to 2.2m in diameter and weigh over 300kg, are said to be appearing in plague-like proportions off Japan's Pacific coast, where they are threatening to ruin the local fishing industry.

Because of their mass, the giant Echizen jellyfish are wrecking fishermen's nets and crushing catches. And that's on a good day, the monsters recently capsized a fishing boat after getting caught in the nets. Score one to the animals.

Experts think global warming could be to blame for the swarms, which drift from their spawning grounds in Chinese and Korean waters. They also say over-fishing has depleted the number of fish which would prey on the jellyfish when they were smaller.

The jellyfish invasion is already said to have cost the Japanese fishing industry millions of Yen. Check out the jumbo jellies, after the jump.