2018년~2021년 제주 양식 넙치(Paralichthys olivaceus)의 주요 병원체 (Streptococcus parauberis, Edwardsiella piscicida, Scuticociliate) 동향 분석

Abstract

Streptococcus parauberis, Edwardsiella piscicida, and scuticociliate are major pathogen diseases in associated with high economic losses in aquaculture. This study were determined whether occurrence of these three major pathogens infections in olive flounder (Paralichthys olivaceus) correspond with changes in water temperature on fish farms in Jeju island. During 2018 to 2021, investigated the different culturing water temperature conditions by region of fish farms that divided in to 4 locations. The average annual water temperature for each region in 2018 was 18.28°C in Daejung, 18.46°C in Namwon, 17.83°C in Sungsan, and 17.57°C in Gujwa. In 2019, it was 18.78°C in Daejung, 18.65°C in Namwon, 18.2°C in Sungsan, and 17.63°C in Gujwa. In 2020, it was 18.1°C in Daejung, 18.1°C in Namwon, 17.8°C in Sungsan, and 17.4°C in Gujwa. In 2021, it was 18.9°C in Daejung, 18.2°C in Namwon, 18.2°C in Sungsan, and 17.7°C in Gujwa. The result of Pearson’s correlation analysis showed culturing water temperature and pathogen detection rate have no significant but confirmed Daejung and Gujwa have big difference in culturing water temperature fluctuation and this caused pathogen detection rate difference specially with E. piscicida. In conclusion, the results of S. parauberis detection rate have no significant correlation with culturing water temperature and growth period of olive flounder size. E. piscicida, detection rate have significant correlation with culturing water temperature and scuticociliate detection rate have significant correlation with growth period of olive flounder size. Additionally, even if the fish farms use similar culturing water temperature, occurrence of pathogenic diseases will occur different by various causes. In the other hand, this result showed that necessity of customized hazard disease control program for each fish farm.