A case study of damage on net cage cultured abalone in Wando, Jeollanam-do by the combined effect
Yu Ri Shin, Byeong-Hak Kim, Hye-Sung Choi, Jun-Ho Koo, Jong-Woo Park, Deok Chan Lee and Jung Jun Park
South Sea Fisheries Research Institute, NIFS, Yeosu 59780, Korea; Marine Environment Research Division, NIFS, Busan 46083, Korea; Oceanic Climate & Ecology Research Division, NIFS, Busan 46083, Korea; Pathology Research Division, NIFS, Busan 46083, Korea
In August-September 2015, massive mortality occurred on net cage cultured abalone in Wando, Korea. We performed research for find mortality cause in 15 farms in Wando. There were no pathogen detection in abalone of research site. However, as a result of the red tide biomonitoring of the NIFS, the density of C. polykrikoides was detected to 4,500 cells/mL in the area of the damaged farm on September 7. At the research day, we detected average density of 26 cells/mL (inside a net cage) and 21 cells/mL (outside a net cage) also, C. polykrikoides were observed on the gill of abalone in three research site. We are considered on damaged abalone to be that the histopathological resesults in gill and hemolymph were effected by acute factors, and histopathological degeneration of hepatopancreas and low glocose concentration were effected by chronic factors. Therefore, it is thought that the mortality of net cage cultured abalone is casued by a combination factors of physiological weakness by the chronical affect and acute affect such as a red tide.
  
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