The MERITENS Percussive Stunner-Bleeder model PSB-6 is a pass-through unit that automatically adjusts to the size of each fish by gripping it at the operculum, regardless of caliber (2 to 10 kg), efficiently performing stunning and gill cutting in fractions of a second, producing irreversible unconsciousness and humane death (Welfare), reducing stress and obtaining a high-quality product.