Deba
Deba bōchō − "fish-preparer" − are a style of Japanese kitchen knives primarily used to cut fish, though are also used occasionally in preparing meat.
Deba have wide blades and are the thickest of all Japanese kitchen knives and come in different sizes − sometimes up to 30 centimetres in length and 10 millimetres thick − but usually considerably shorter, normally between 12 and 20 cm long with a blade between 5 and 7 mm thick. The larger form of knife is called an hon-deba, whereas the smaller form is a ko-deba.
Text adapted from Wikipedia, CC BY-SA 4.0. Photograph: Wikimedia Commons (see Commons), Wikimedia Commons.