The Fish class sloop, also known informally as Fish boat is a one-esign sailboat designed in 1919 by New Orleans resident Rathbone De Buys, member of the Southern Yacht Club. It is reputed to have been the most popular sailboat racing class on the US Gulf Coast in the early 20th century and was the Gulf Yachting Association one-design racer until it was replaced by the Flying Scot in 1969.