The term 'large food fish' can refer to four different species of fish: TUNA (4 letters), Barramundi (10 letters), HADDOCK (7 letters) and Maigre (6 letters). TUNA is a saltwater fish found in tropical and temperate oceans around the world, and is a popular choice for sushi. Barramundi is an Australian fish found in both fresh and saltwater, and is a popular sport fish. HADDOCK is a North Atlantic fish that is often used in fish and chips. Maigre is a Mediterranean fish that is often used in French cuisine. All four of these fish are large enough to be considered food fish, and are popular choices for meals.