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Journal of Environmental BiologypISSN: 0254-8704 ; eISSN: 2394-0379 ; CODEN: JEBIDP |
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Abstract - Issue Nov 2009, 30 (6) BackSurvival and growth of Cochlodinium
polykrikoides red
tide after addition of yellow loess Young 1Aquaculture
Environment Institute, NFRDI, 361 Yongun-ri Sanyang-up Tongyeong-city Kyungnam, 650-943, 2 Gyeong Sang National University, 445 Inpyeong-dong Tongyeong-city Kyungnam, 650-943, (Received: Abstract: We examined the survival rate of Cochlodinium polykrikoides after
yellow loess addition and conducted culture experiments to investigate the
possibility that red tides may be caused by C. polykrikoides
individuals that are precipitated when loess is added. At least 15% of the C. polykrikoides cells that precipitated to the bottom layer
either by the addition of loess or no addition survived for 1 week at all
growth phases, rather than disappearing immediately after precipitating.
However, no live cells were observed after 20 days, regardless of phase or
loess addition. In the exponential phase, the number of C. polykrikoides
cells increased to >2886 cells ml-1 after loess was added.
However, in the stationary phase, the number of cells did not increase until 18
days. In the exponential phase, those C. polykrikoides
that survived precipitation caused by scattering loess on cultures did not
appear to have the ability to cause red tides again because of the short red tide
periods in the field, long lag time after loess addition, and low survival rate
after loess addition. Key
words: Cochlodinium
polykrikoides, Growth yield, Red tide, Survival rate,
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