The term 'Important Food Fish' is composed of three words, each of which is represented by a six-letter crossword solution. The first word is 'PLAICE, ' which is a flatfish found in the North Atlantic and North Sea. It is an important food fish, as it is a popular seafood item in many countries. The second word is 'COD, ' which is a type of fish found in the Atlantic, Pacific, and Arctic oceans. It is also an important food fish, as it is widely consumed around the world. The third word is 'SALMON, ' which is a species of fish found in the Northern Hemisphere. It is an important food fish, as it is a popular source of protein and omega-3 fatty acids.