Journal of fish pathology (한국어병학회지)

The Korean Society of Fish Pathology (한국어병학회)
권호 표지

Susceptibility of rainbow trout Oncorhynchus mykiss and cherry salmon Oncorhynchus masou against Ichthyophthirius multifiliis

무지개송어와 산천어의 백점충에 대한 감수성

  • Kim, Yi-Cheong (Inland Aquaculture Research Center, NFRDI) ;
  • Kim, Jin-Do (Inland Aquaculture Research Center, NFRDI) ;
  • Jee, Bo-Young (Pathology Division, National Fisheries Research and Development Institute) ;
  • Jung, Sung-Hee (Pathology Division, National Fisheries Research and Development Institute) ;
  • Seo, Jung-Soo (Pathology Division, National Fisheries Research and Development Institute) ;
  • Park, Sung-Woo (Department of Aquatic Life Medicine, Kunsan National University)
  • 김이청 (국립수산과학원 내수면양식연구센터) ;
  • 김진도 (국립수산과학원 내수면양식연구센터) ;
  • 지보영 (국립수산과학원 병리연구과) ;
  • 정승희 (국립수산과학원 병리연구과) ;
  • 서정수 (국립수산과학원 병리연구과) ;
  • 박성우 (군산대학교 수산생명의학과)
  • Published : 2009.12.01
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Abstract

This study was performed to natural infection of Ichthyophthirius multifiliis and mortalities of two fish species were compared at 10${^{\circ}C}$ and 17${^{\circ}C}$ after artificial infection with the parasite. Subsequently compared to motality by the artificial infection with the different parasite orgin of host at 17${^{\circ}C}$ using rainbow trout Oncorhynchus mykiss. The prevalence of Ichthyophthirius multifiliis in cherry salmon was higher than that in rainbow trout during the periods of low temperature but no difference in high temperature season. The parasite was not detectable in culturing water and detritus except May that of density has been high. Susceptibility to the parasite was higher in cherry salmon than in rainbow trout at 10${^{\circ}C}$ of water temperature but no difference between two fish species at 17${^{\circ}C}$. When rainbow trout were infected with Ichthyophthirius multifiliis from rainbow trout and cherry salmon at 17${^{\circ}C}$, there was no difference in death of host. These results suggest that cherry salmon have higher susceptibility to Ichthyophthirius multifiliis than rainbow trout at low temperature.

무지개송어와 산천어에 있어서 백점충의 자연 감염 및 수온별, 어종 유래별 인위 감염에 의한 폐사율을 비교하였다. 백점병은 수온이 낮은 시기에는 산천어가 무지개송어에 비해 잘 감염되었으나, 수온이 높은 시기에는 두 어종간의 차이가 없었다. 백점충의 밀도가 높았던 5월을 제외하고는 양어지의 사육수, 찌꺼기에서 백점충이 검출이 되지 않았다. 수온 10℃에서는 무지개송어에 비해 산천어가 백점충에 대한 감수성이 높았으나, 수온 17${^{\circ}C}$에 서는 폐사에 있어 별 차이가 없었다. 이상의 결과로 무지개송어보다 산천어가 저수온에서 백점충에 대한 감수성이 높음을 알 수 있었다.

Keywords

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