Dunno about that, Connie. We saw on the Discovery Channel (I think) the other day about the box jellyfish off the coast(s?) of Australia. I believe it said their poison is 10,000 (ten thousand) times more potent than cyanide. One of the many reasons why I always prefer to swim in places where live things cannot get at me. I do not like slimy lake bottoms [shudder e], and, though I have swum in the ocean, it is always with trepidation.