A system for removing parasites from fish includes a downwardly angled enclosed conduit through which individual fish freely pass, and two or more spaced sets of arms extending inward from the conduit. There is a spray nozzle for each arm connected to a fluid source for dislodging parasites from the fish. The arms are adjustable relative to the enclosed conduit depending on the size of the fish in the conduit for closely spacing the spray nozzles with respect to the fish without stressing or harming the fish.