Dear Loni and Henk, Thanks much for the info. I do recall that copepod parasites of fish are sometimes referred to as "sea lice"", but I was pretty sure those didn't bother people. I didn't know larval jellyfish are also tagged with that name. Thanks for the website. I also found one myself, based on Joni's information: http://www.fau.edu/safe/sea-lice.html Paul M.