Maguro knives are highly specialized knives used to cut and fillet large whole tuna fish. These knives have an extremely long blade and handle. These lengthy knives are ingeniously designed and crafted with a softer carbon steel blade than other knives, making it easier to repair minor chipping damage sustained to the blade during the strenuous job of filleting large fish. The maguro knife is commonly found in Japanese fish markets such as Tsukiji Market, where they hold tuna auctions every morning.