The Global G-7 Oriental Deba is a traditional Japanese knife and it is essentially the G-4 with a single bevel. It is short but heavy, made especially for whole fish. Due to the squat design, you can also handle chopping tasks with ease.
The weight of the deba knife allows it to cut through fish bones to sever the head and tail from the fish and this is what it is designed to do. Using the tip of the blade you can also fillet fish, Japanese style.