Deba bōchō
Deba bōchō (Japanese: 出刃包丁)—"fish-preparer"—are a style of Japanese kitchen knives primarily used to cut fish, though are also used occasionally in cutting meat. Deba have wide blades and are the thickest of all Japanese kitchen knives and come in different sizes—sometimes up to 30 centimetres (12 inches) in length and 10 millimetres (0.4 inches) thick—but usually considerably shorter, normally between 12 and 20 cm (5 and 8 in) long with a blade between 5 and 7 mm (0.2 and 0.3 in) thick.