Scientists believe they are growing faster than ever before . Rising water temperatures and overfishing are behind the surge in population . Irukandji , lists jellyfish among the world 's most deadly fish . Contrary to popular belief , treating a jellyfish sting with urine is n't advised .
Scientists say jellyfish are proliferating faster than ever before . Changing water temperatures and overfishing are behind the surge in population . Irukandji , box jellyfish among the world 's most deadly varieties . Contrary to popular belief , treating a jellyfish sting with urine is n't advised .