A fishing knife lives in the worst conditions a blade can face: salt, water, and long spells shut in a damp box. That is why the steel choice matters more here than the shape.Fillet blades. Long, narrow and flexible, so the blade can follow the backbone and ride over the ribs rather than cutting through them. Six to eight inches suits most freshwater and inshore fish; nine inches and up is for salmon and larger saltwater species.Steel. For boat and saltwater use, 440C stainless is the right answer and we will say so plainly. Our Damascus takes a finer edge and looks far better, but it is reactive carbon steel and it will spot if it is put away wet. If the knife lives in a tackle box, choose stainless.Ours. Full tang, hardened to 58 to 60 HRC, with grippy handle materials and a fitted sheath.Will a Damascus fillet knife rust? Yes, if neglected. Rinse the salt off, dry it, wipe a little mineral oil down the blade, and it will last a lifetime. Ignore it for a weekend in a wet bag and it will spot.How flexible should a fillet blade be? Enough to flex under light hand pressure, not so much that it wanders. Stiffer blades suit bigger fish.Can I use it for bait? Yes, but a thin fillet edge is not a chopping edge. Keep it off bone and shell.
Not sure which one you need? See boning knife vs fillet knife.
