Damage potential of Karenia mikimotoi to abalones Haliotis discus hannai
Sang-Jun Lee, Qtae Jo, Jido Han, Mi-Ae Jeon, Bong-Seok Kim, Young-Tae Park and Moon-Ho Son
Aquaculture Industry Research Division, South Sea Fisheries Research Institute, NIFS. Jeonnam 59780, Korea Fisheries Resources and Environment Research Division, South Sea Fisheries Research Institute, NIFS. Jeonnam 59780, Korea
The alleged Karenia mikimotoi involvement in Haliotis discus hannai mass mortality has been controversial as the low toxicities might not be consistent with the mortalities. Laboratory test might be a likely approach to explain the inconsistence. Tested were a series of exposures of K. mikimotoi (KM02 KSS) concentrations (0, 5, 10, or 20 x 103 cells ml-1) to adult H. discus hannai at 5 temperatures: 3 for 23, 26, and 28℃ during increasing period (23A, 26A, 28A) and 2 for 28 and 26℃ during decreasing period (28B and 26B). K. mikimotoi damage was highly temperature-dependent. Of 5 temperatures, 28A was the single damage inducer. The abalone mortality at 28A appeared to be due to loss of physiological strength caused by temperature itself, which was evidenced by increased mortality of abalones growing at the same condition in the commercial farm from which abalones were sampled for each exposure. Control mortality (15%) at 28A also endorsed the estimation. Cochlodinium polykrikoides (NIFS CP001) damage was viewed at lower temperature or when the abalones were still strong enough, suggesting the algal damage potential might be bigger than K. mikimotoi. Findings from K. mikimotoi together with those from C. polykrikoides suggest that K. mikimotoi damage potential to the abalones might be minor or inconsistent with the alleged mass mortality of the abalone.
  
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