Welcome to the FISHING KNIVES category at Knives Plus. Our selection of fishing knives will include folders and fixed blades. Fillet knives will vary in degree of flex and in size. These knives are generally made of stainless steel to keep them from rusting. If you fish in salt water, it would be a good idea to wash them off before storing them. Fillet knives come in plastic sheaths and are light enough to put in your tackle box. Whether you are a deep sea fisherman or just going fishing with your kids, this section is for you.