Les mentions sting rays in at least one episode. I believe in the Amazon Jungle ep. when he's noodling for catfish he mentions that Stingrays like to hide in the same places and how the natives fear the sting more than any snake bite.

He fishes with the torch during the episode when he's on the tropical island in Costa Rica playing the stranded scuba diver...I believe (I've seen them all so many times you think I'd rememeber but they all sort of run together after a while).