I have an article from 1963 Salwater Fishing, that was given to me about the Canal. In this article the guy talks about an old timer who would put clamworms on a small piece of wood and float it out into the Canal with a rubber band holding it in place. He would also have a small keel on the board to keep it upright.
cast out from say the fish pier an 8 oz sinker, the main line, attach about a 6 or 8 ft line with the eel on it to the main line with a fish finder or sliding clip deal
they use a set up like this in FL for shark from piers