Fish Pathology
Online ISSN : 1881-7335
Print ISSN : 0388-788X
ISSN-L : 0388-788X
Research Articles
Efficacy of Sand Filtration and Ultraviolet Irradiation as Seawater Treatment to Prevent Kudoa septempunctata (Myxozoa: Multivalvulida) Infection in Olive Flounder Paralichthys olivaceus
Toyohiro NishiokaJun SatohTohru MekataKoh-ichiro MoriKengo OhtaTaizo MoriokaMeibi LuHiroshi YokoyamaTomoyoshi Yoshinaga
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2016 Volume 51 Issue 1 Pages 23-27


Kudoa septempunctata infecting the muscle of the olive flounder Paralichthys olivaceus has been recently demonstrated to cause food poisoning in humans who eat the raw flesh of flounder. In the present study, we assessed the effective treatments of a water supply to prevent K. septempunctata infection in a flounder hatchery where the parasite was enzootic. The prevalence of infection in a positive control fish group exposed to unfiltered seawater was 33% at 3 months post-exposure, whereas no infection was observed in the treated fish groups exposed to sand-filtered seawater, sand- and cartridge (5 μm)-filtered seawater or sand-filtered seawater followed by ultraviolet (UV) irradiation at a dose of 46 mJ/cm2. Additionally, treatment with UV irradiation alone was effective for the prevention of K. septempunctata infection. To ensure complete protection from K. septempunctata infection, we recommend double treatments of a water supply with sand filtration and UV irradiation in olive flounder hatcheries.

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© 2016 The Japanese Society of Fish Pathology
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