Maguro bōchō

Long maguro bōchō, used to filet tuna at the Tsukiji fish market

A maguro bōchō in use at the Tsukiji fish market in Tokyo

A maguro bōchō (Japanese: 鮪包丁, lit. "tuna knife"), or maguro kiri bōchō (鮪切り包丁, lit. "tuna cutter"), is an extremely long, highly specialized Japanese knife that is commonly used to fillet tuna, as well as many other types of large ocean fish.

The maguro bōchō is a long knife with a blade length of 30 cm (12 inches) to 150 cm (60 inches) in addition to a long handle. It can fillet a tuna in a single cut, although usually two people are needed to handle the knife and the tuna. Often they are used by two people simultaneously, where the second person handles the other end, using a towel wrapped around the blade for protection.^[1] The flexible blade can be curved to match the shape of the spine to minimize the amount of meat remaining on the tuna carcass.^[2]

They are commonly found at wholesale fish markets in Japan, the largest of which is the Tsukiji fish market in Tokyo, for which they are often called oroshi-hōchō (卸包丁, lit. "wholesale knife"), as there is little need for them elsewhere. They may be found at very large restaurants, but they are not used in a regular Japanese kitchen, unless there is a frequent need to fillet tuna with a weight of 200 kg (440 pounds) or more.

They are not designed for use as weapons, but as tools, although they have been used as weapons by yakuza.^[3]

References

↑ Slicing open a giant tuna at the Tsukiji Fish Market youtube
↑ Japanese Knives and Sharpening Techniques. Tsukiyama Yoshitaka Cutlery (2017). 144 pag. ISBN 978-4416615737
↑ Bestor, Theodore C. (2004). Tsukiji: The Fish Market at the Center of the World. University of California Press. p. 26. - Read online, limited access

Knives and daggers
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Kitchen and table knives	Boning Boti Bread knife Butcher knife Butter knife Cheese knife Chef's knife Cleaver Electric knife Fillet knife Grapefruit knife Lame Mezzaluna Parmesan knife Pizza cutter Splayd Steak knife Tomato knife Japanese kitchen knives Deba bōchō Maguro bōchō Nakiri bōchō Santoku Sashimi bōchō Udon kiri Unagisaki hōchō Usuba bōchō Yanagi ba
Other knives	Aircrew Survival Egress Knife Athame Balisong/Butterfly Ballistic Ballpoint pen knife Bayonet Boline Bolo Boot knife Bowie Cane knife Ceramic knife Clip point Combat knife Commander Corvo CQC-6 Deba bōchō Diving knife Drop point Fairbairn–Sykes fighting knife Gerber Mark II Ginsu Golok Gravity knife Guna Hacking knife Higonokami Hunting knife Jacob's ladder Karambit Kard Kirpan Kitchen knife Kukri Laguiole knife Machete Mandau Marking knife Misericorde Mora knife Multi-tool Navaja Neck knife Nontron knife Opinel knife Palette knife Pantographic knife Parang Penknife Penny knife Pirah Pocketknife Phurba Putty knife Puukko Rampuri Resolza Sabatier Sami knife SARK Scalpel Seax Sgian dubh Sharpfinger Sheath knife Shiv Sliding knife Smatchet SOG Knife Straight razor Strider SMF Survival knife Swiss Army knife Switchblade Taping knife Throwing knife Trench knife Tumi Ulu Utility knife Warrior knife Wedung X-Acto Yatagan
Daggers	Anelace Applegate–Fairbairn fighting knife Arkansas toothpick BC-41 Bagh nakh Balarao Baselard Bichuwa Bollock dagger Cinquedea Dirk Ear dagger Emeici Facón French Nail Gunong Hunting dagger Janbiya Jile Kabutowari Kaiken Kalis Katar Khanjali Khanjar Kris Kunai Mark I trench knife Parrying dagger Poignard Pugio Push dagger Rondel dagger Seme Shobo Sica Stiletto Tantō U.S. Marine Raider stiletto V-42 Yoroi-dōshi
Manufacturers	Aitor Knife Company Al Mar Knives American Tomahawk Company Aritsugu Benchmade Böker Buck Knives Camillus Cutlery Company Cattaraugus Cutlery Company Chris Reeve Knives Chroma Cnife Clauss Cutlery Company Cold Steel Columbia River Knife & Tool Cuisinart Cutco Dalian Hanwei Metal Dexter-Russell DOVO Solingen Ek Commando Knife Co. EKA Emerson Knives F. Dick Fällkniven FAMAE Fiskars Gerber Legendary Blades Füritechnics Glock Ges.m.b.H. Imperial Schrade Ka-Bar Kershaw Knives KitchenAid Korin Japanese Trading Company Kyocera Leatherman Mad Dog Knives Marble Arms Medford Knife and Tool Microtech Knives Morseth Muela Murphy Knives Olfa Ontario Knife Company Opinel Randall Made Knives Rösle Sabatier Shun Cutlery Slice, Inc. SOG Specialty Knives Spyderco STI Knives Strider Knives Thiers Issard TOPS Knives Tramontina Victorinox W. R. Case & Sons Cutlery Co. Carl Walther GmbH Wenger Western Knife Company Wilkinson Sword Wüsthof Yoshida Metal Industry Global Zero Tolerance Knives Zwilling J. A. Henckels
Knifemakers	Rex Applegate James Black Blackie Collins John Nelson Cooper Ernest Emerson Jerry Fisk Bill Harsey Jr. Phill Hartsfield Gil Hibben Jimmy Lile Bob Loveless William F. Moran Ken Onion Ralph Osterhout Bo Randall Chris Reeve A. G. Russell Jody Samson William Scagel Mike Snody Robert Terzuola Michael Walker Buster Warenski Daniel Winkler
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