High Quality Content by WIKIPEDIA articles! USS Haddock (SS-231), a Gato-class submarine, was the second submarine of the United States Navy to be named for the haddock, a small edible Atlantic fish, related to the cod. A previous submarine had been named Haddock (SS-32), but was renamed K-1 prior to her launching, so Haddock (SS-231) was the first to actually bear the name.