A device and method configured to jet pressurized liquid from hemal arch of fish into arteries and veins to perform instantaneous fish body blood removal, thereby cleansing the blood vessel interior. The device jets pressurized liquid into hemal arch from severed fish tail to perform fish ikijime (quality-preserving quick kill). A pressure applying device applies pressure to and discharges liquid and a hose conveys the pressurized liquid discharged from the pressure applying device. A valve connected to the hose opens and closes the flow path of the liquid and a nozzle jets the liquid when the valve is in open state. The valve opens or closes the flow path in response to a button being pushed down or pulled up. The nozzle is formed to taper from a large diameter base region toward a tip region, and tip region center hole diameter is formed thin.