Scientists believe they are growing faster than ever before . Meanwhile , there 's debate over what actually works on a jellyfish sting . 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 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 .