A Fugu Hiki (Japanese: フグ引き aka, Fugubiki 舟行) knife has a thin, flexible, broad blade about 15 cm (6 inches) long, and a wooden handle.
It is used to slice fugu fish into very thin sashimi. In fact, it is the only knife in Japan that is legal to use when filleting fugu fish.
It is often made in a shape and design meant to look like a fugu fish.
It is stored separately from other knives in order to avoid any possible cross-contamination from any lingering fugu poison.
“Fugu Hiki” means literally “pufferfish-puller.”
Japanese Kitchen Knife Types And Styles. Accessed October 2019 at http://zknives.com/knives/kitchen/misc/usetype/all/index.shtml