Deba Knife is a traditional Japanese single beevel Knife. It is used for filleting fish. Also it can be used for butchering meat and poultry too. Because the blade is thick and heavy,  It could be good for cutting through fish bones, chicken bones, crab or other seafood. Deba Knives range from 100mm to 240mm in length of the blade and different lengths offer different benefits. Generally blade length between 150mm and 195mm is  popular. 

Ajikiri knife has a lighter, shorter and thinner blade than Deba knives. It is designed for filleting small fishes like mackerels. 

Since Deba and Ajikiri has single bevel, there are different shape for right hander and left hander.