North Atlantic fish (7)
(Other definitions for halibut that I've seen before include "Large flatfish, tasty to eat" , "Large flatfish used as food" , "Large food fish" , "Fish found in Bali hut" , "Fishy sort" .)
(Other definitions for haddock that I've seen before include "Swimmer" , "Popular food fish" , "Edible fish like small cod" , "White fish" , "Cod-like fish" .)