Capillaria spp are a common parasite of aquarium fish, particularly freshwater angelfish.
Heavy infections in juvenile angelfish have been associated with poor growth rates and an inability to withstand shipping and handling.
Treatment with fenbendazole (25 mg/kg for 3 days) is recommended, but efficacy has not been firmly established. Levamisole (10 mg/L) administered as a bath treatment for 3 days has also been recommended. Ivermectin is highly toxic to aquarium fish, particularly cichlids, and its use is not recommended.