Abstract
Fish lice can cause significant morbidity and death in heavily infested fish. In addition to being a mechanical irritant when sucking blood, Argulus sp have been shown to be the vector for other fish diseases. Koi carp from a pond environment were presented with multiple raised dark spots on their dorsa and sides. The primary differential disease diagnosis was an Argulus sp. Parasites removed from the affected fish were examined under a dissection microscope, and the definitive diagnosis was determined to be Argulus sp infestation. Treatment with lufenuron (Program; Novartis, Greensboro, NC USA) was initiated with one 409.8-mg tablet per 1,000 US gallons (3,785 L) of water for a concentration of approximately 0.1 mg/L. This treatment was repeated once per week for 5 weeks. The fish have been monitored for 13 months after the initial treatment, and thus far, there has been no reappearance of Argulus sp within the aquatic environment.
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