
Gerber Sengyo Knife with Salt Rx Protection
The Gerber Sengyo sits between the Controller fillet knife and the Rigor Scimitar in the Salt Rx lineup. Its 9.5" blade is long enough for mahi and striper fillets while still being maneuverable for detail work. Full tang construction, 9Cr18MoV steel, and a hard sheath make it a versatile workhorse.
- 9.5" 9Cr18MoV blade with relief etching
- Full tang construction
- Salt Rx corrosion and antimicrobial protection
- Hard sheath with retention strap
The All-Around Saltwater Knife
If you could only own one saltwater knife, the Sengyo would be in the conversation. The 9.5" blade handles medium to large fish with authority while remaining nimble enough for rib removal and skinning. It fills the gap between a small fillet knife and a large scimitar.
Full tang means there is steel running all the way through the handle. Relief etching reduces drag through thick fillets. The hard sheath with retention strap protects the blade and your gear during transport. Gerber's limited lifetime warranty backs it all up.
Full tang means there is steel running all the way through the handle. Relief etching reduces drag through thick fillets. The hard sheath with retention strap protects the blade and your gear during transport. Gerber's limited lifetime warranty backs it all up.
9.5" Versatile Blade
Long enough for sweeping fillet cuts on mahi, stripers, and drum. Short enough to maintain control for detail work around rib bones and pin bones. Relief etching keeps cuts smooth.
Full Tang Construction
Steel runs through the entire handle for maximum strength and leverage. No flex at the handle joint. This is a knife built for daily use on the cleaning table.
Hard Sheath with Strap
The included sheath protects the blade edge and prevents accidental cuts during storage. The retention strap holds the knife securely even if the sheath gets knocked around on the boat.
How to Fillet with the Gerber Sengyo
- Remove the knife from its sheath and place the fish on a flat surface
- Cut behind the gill plate down to the backbone
- Run the 9.5" blade along the backbone in one smooth stroke
- Use the tip to work around rib bones and pin bones
- Skin by holding the tail and cutting between flesh and skin
- Rinse, dry, and return to the sheath
Specs & Common Questions
Everything you need to know before you buy
Full Specifications +
| Brand | Gerber |
| Blade Steel | 9Cr18MoV |
| Blade Length | 9.5" |
| Construction | Full tang |
| Protection | Salt Rx system |
| Handle | Glass-reinforced polypropylene |
| Includes | Hard sheath with retention strap |
| Warranty | Limited lifetime |
| Price | $59.99 |
How does the Sengyo compare to the Controller? +
The Sengyo has a 9.5" full tang blade designed as a general-purpose fish knife. The Controller has a more flexible blade optimized specifically for filleting. Both use 9Cr18MoV and Salt Rx. Check our knife collection.
Is this good for tuna? +
For small to medium tuna (up to 30 lbs), yes. For larger tuna, step up to the Rigor Scimitar (11" blade). Our tuna guide has more processing tips.
What species is the Sengyo best for? +
Mahi, stripers, redfish, drum, snook, and other medium to large species. It is the sweet spot between a small fillet knife and a large processing knife. See our mahi guide.
Does it come with a warranty? +
Yes, Gerber includes a limited lifetime warranty. The Salt Rx finish and 9Cr18MoV steel are built to last, and Gerber stands behind their products. Browse all Gerber knives here.
Can I use this as a diving knife? +
It is not designed as a dive knife, but the corrosion resistance and sheath make it capable in a pinch. For dedicated diving, look for a knife with a blunt tip. Our knife selection has more options.
How do I sharpen this blade? +
Use a fine ceramic rod or whetstone at the factory angle. The 9Cr18MoV steel holds an edge well, so you will not need to sharpen often. A quick hone before each use keeps it performing. See our gear guide.