The term 'COMMON FOOD FISH' can be broken down into three crossword solutions: COD (3 letters), SARDINE (7 letters), and TUNA (4 letters). COD is a type of fish found in the North Atlantic and Mediterranean Sea, and is a popular choice for fish and chips. Sardines are small, oily fish that are often canned and eaten as a snack or part of a meal. TUNA is a large, migratory fish found in tropical and temperate waters around the world, and is a popular choice for sushi and sandwiches. All three of these fish are commonly eaten around the world.