Damage potential of Karenia mikimotoi to abalones Haliotis discus hannai-II
Sang-Jun Lee, Jido Han, Mi-Ae Jeon, Chang-Yong Im and Qtae Jo
Aquaculture Industry Research Division, South Sea Fisheries Research Institute, NIFS. Jeonnam 59780, Korea Jeollanam-do Institute of Oceans and Fisheries Science. Jeonnam 59782, Korea
Our previous findings revealing that Karenia mikimotoi toxicity might not be potent enough to cause abalone Haliotis discus hannai mass mortality necessitated further verification in more scientific ways. Focal points were on exposure extension and use of replication and harmless flagellate reference for valid comparison. The exposure lasted 2 days with a daily solution renewal. Harmless Tetraselmis suecica were additionally tested as a reference. All the tests were duplicated. The key methods otherwise mentioned followed our previous study (see Korean J. Malacol. 35(2): 87-92). Results were clear-cut, harmless or harmful. K. mikimotoi at 2 x 104 cells ml-1 together with the two references, seawater and T. suecica at 10 x 104 cells ml-1, were harmless all the way throughout the exposure, while a reference, Cochlodinium polykrikoides at 5 x 103 cells ml-1, was markedly harmful. C. polykrikoides damage was statistically significant from 12 hours after exposure (P < 0.05). These data are highly suggestive of lower damage potential of K. mikimotoi to the abalone even though something uncertain and thus needing verification are still existing.
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