BEST FILLET KNIFE FOR FISH TO BUY IN 2022For home cooks, filleting fish can be a real challenge, especially with the large, blunt knife used for cutting meat in your kitchen. However, if you use the right tool, it will be much easier. That's why you would need the best fillet knife for fish. A fillet knife is a very flexible member of the boning knife family that is used to filet and prepare fish. It should be lightweight, flexible, and sharp enough to separate flesh from bone easily.