System for delousing fish, comprising a source of lice infected fish, a pump Device arranged for transporting fish from said source to a delousing module (200), a warm water source (300) arranged to provide lukewarm water to the delousing module (200). The delousing module (200) exhibits an inlet (201), an outlet (202), a fish flow path (203) there between including a bath (204a, 204b) with lukewarm water. Infected fish is guided through the bath (204a, 204b) for about half a minute. A rotary paddle Wheel (205a, 205b) with vanes (206) is arranged rotary in the bath. The space between adjacent vanes (206) defines compartments (215) arranged to accommodate and guide fish through the bath to remove louse.
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