Occurrence and treatment of mixed infections with Vbrio anguillarum and Ichthyobodo sp. from cultured oliver flounder (Paralichthys olivaceus)

양식 넙치에서 Vbrio anguillarum 및 Ichthyobodo sp.에 의한 혼합 감염증의 발생 및 치료

  • Jang, Hwan (National Veterinary Research and Quarantine Service, MAF) ;
  • Moon, Jin-San (National Veterinary Research and Quarantine Service, MAF) ;
  • Joh, Seong-Joon (National Veterinary Research and Quarantine Service, MAF) ;
  • Kim, Ji-Yeon (National Veterinary Research and Quarantine Service, MAF) ;
  • Son, Seong-Wan (National Veterinary Research and Quarantine Service, MAF)
  • Accepted : 2007.08.30
  • Published : 2007.09.30


The high mortality (65.5%) of young olive flounder (Paralichthys olivaceus) showing skin ulcers occurred in fish obtained from a commercial cultured farm at Donghae on the eastern coast of Korea at March 2006. The dorsal skin showed ulcer lesions and large amount of mucus. We isolated Ichthyobodo sp. from the gill, and Vibrio anguillarum from the liver and kidney of dead and diseased fish. All of the fish infected with the V anguillarum and Ichthyobodo sp. were treated with 100 ppm formalin for 1 h, and treated with oxolinic acid for 4 h at $22^{\circ}C$, respectively. The formalin treated group was observed the low mortality (2.9%) when compared with high mortality of non-treated (82.9%), and of antibiotic treated group (85.9%) against mixed infections by Vibrio anguillarum and Ichthyobodo sp. organisms. We confirmed complete elimination against mixed infections of Vibrio anguillarum and Ichthyobodo sp. with 100 ppm formalin treatment.


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