What Size Fillet Knife Do I Need?
Match the blade to the fish: 4–6 inches for panfish, 6–7 inches for walleye, bass and trout, 7–9 inches for salmon, redfish and snapper, and 9 inches or more for tuna, halibut and other large saltwater fish. If you only buy one, a 7-inch flexible blade covers most anglers.
- Panfish 4–6"Bluegill · Crappie · Perch
- Mid-size 6–7.5"Walleye · Bass · Trout
- Big fish 7.5–9.5"Salmon · Redfish · Snapper
- Giants 9.5–12"+Tuna · Halibut · Mahi
Fillet knife size chart
Use the chart below as a starting point, then adjust for how big your fish usually run.
| Fish | Typical size | Blade length |
|---|---|---|
| Bluegill, crappie, perch | Under 1 lb | 4–6" |
| Walleye, bass, trout | 1–5 lb | 6–7" |
| Salmon, redfish, snapper, striper | 5–20 lb | 7–9" |
| Tuna, halibut, mahi, large cod | 20 lb+ | 9–12" (or electric) |
Why blade length matters
A blade that's too short forces you to saw, which tears meat. A blade that's too long is hard to control on small fish and can flop around the rib cage.
Ideally the blade should be a little longer than the fish is wide, so you can remove the fillet in long, single strokes.
What about electric fillet knives?
Electric knives usually come with several blades (often 7–12 inches). They're great for big catches and large fish, but less precise on delicate fillets.
Blade length for popular fish
Here's a more detailed guide for common freshwater and saltwater species.
| Fish | Recommended blade | Notes |
|---|---|---|
| Bluegill, crappie, perch | 4–6" | Short and flexible for small fillets |
| Trout, walleye, bass | 6–7" | The best all-round size |
| Pike | 7" | Extra cuts needed for 'Y' bones |
| Catfish | 7–9" | Stiffer blade helps through thick meat |
| Flounder | 7" | Flexible blade for thin flatfish fillets |
| Redfish, snapper, striped bass | 7–9" | Medium flex for bigger, firmer fish |
| Salmon, steelhead, lake trout | 8–9" | Long, narrow blade for long fillets |
| Tuna, halibut, mahi, large cod | 9–12" | Long stiff blade or an electric knife |
If you catch lots of different fish
One knife rarely covers everything. A common setup is a 6-inch flexible knife for small fish plus a 9-inch knife for big ones. If you only want one, a 7-inch flexible blade is the best compromise.
Electric fillet knives often include several blade lengths in one kit, which makes them a good choice if you clean many species.
Common questions
Is a 7-inch fillet knife big enough?
For most freshwater fish, yes. A 7-inch blade handles panfish up to walleye and bass. For salmon and big saltwater fish, add an 8–9-inch knife.
What size fillet knife is best for walleye?
A 6–7-inch flexible fillet knife is ideal for walleye.
What size fillet knife do you need for catfish?
A 7–9-inch knife, ideally with a slightly stiffer blade, because catfish have thick meat and tough skin.
What size fillet knife is best for salmon?
An 8–9-inch narrow blade, long enough to remove a whole side in a few strokes.
Our picks for this job
Keep reading
- How to Fillet a FishFillet a fish in seven steps: cut behind the gills, run the blade along the backbone, remove the ribs and skin it. Tools and tips included.
- How to Sharpen a Fillet KnifeSharpen a fillet knife at a 15–20° angle with a whetstone, rod or pull-through sharpener, then hone it between uses. Step by step.
- Fillet Knife vs Boning KnifeA fillet knife is thinner and more flexible for fish; a boning knife is stiffer for meat and poultry. Here's when to use each.
- What Is a Fillet Knife?A fillet knife is a thin, flexible knife for removing fish fillets and skin. See what one looks like, its parts, uses, and fish knife vs fillet knife.
- Which Fillet Knife Stays the Sharpest?Any good fillet knife is sharp out of the box; what differs is how long it stays sharp. Our picks compared by steel and edge retention.
- Fishing Knife Guide: Types and Which to ChooseThe main types of fishing knives (fillet, bait, electric and folding) and which one you need for cleaning fish, cutting bait and line.
- Fillet knife buying guideLength, flex, steel, grip and electric vs manual.