Thanks for the response. What a great experience! Swimming in the Salish Sea usually involves a wet suit, but I'll still have to try that sometime when I find a smack of moon jellies. My understanding is moon jellies have very little if any sting for a human but that every now and again a person will have a reaction to their sting. Aside from the nettle-like sting of the lions mane, the jellies in the part of the world are pretty benign.