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| Observation of Life Cycle and Control of Parasite Amyloodinium ocellatum at Cyst Stage |
| ZHANG Yi,HUANG Weiqing,HAN Kunhuang,LIU Zhaokun,KE Qiaozhen,CHEN Jia,CHEN Shixi |
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Abstract The theronts of parasite A myloodinium ocellatum were collected from infected large yellow croaker ,L arimichthys crocea ,and placed on the concave glass for observation of the continuously splitting process .It was found that the theronts had diameter of 61 .3-112 .7 μm ,and reproduction with two divi‐sion ways ,one time increase in cell quantity by each completed cell division .Most of the theronts devel‐oped into two cell phase in 8-12 h ,then completed a division every 4-10 h at water temperature of 27-29 ℃ ,with the maximum 8 times and the minimum 2 times .The spores were hatched from all the theronts with different division frequency in 48 -66 h .The obvious removal of the theronts were observed in the gill filaments of the large yellow croaker exposed to mixture of copper sulfate and ferrous sulfate .
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Received: 25 November 2015
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