Actually, I know the answer to that one. It is like a bee sting. A pretty good sized bee, but is rarely fatal. It is probably just about as likely that you would die of a bee sting. Just run it under hot water and it will help to detoxify the toxin.
I didn't expect to get this many answers, so I'm going to put up a post in the Reef Section about how people net, scoop, strain their fish. Should get a lot of good tips.