as a child living in Cyprus I trod on a poisonous fish and had to have an anti venom Which was administered at a first aid point on the beach. I was told that without the anti venom I could have died.  I have been unable to find out what fish it was and would love to know. Do you have any ideas?
Dave

see below - probably a weaver or scorpion fish.
http://www.agrino.org/fishing/htmldocs/sltwtrfish.html