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題 名 | Yeast Infection in Prawns (Macrobrachium Rosen-Bergii de Mann) in Taiwan=臺灣地區感染泰國蝦的酵母菌 |
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作 者 | 盧秀琴; 湯鳳菊; 上野洋一郎; 郭光雄; 陳秀男; | 書刊名 | Acta Zoologica Taiwanica |
卷 期 | 8:1 1997.01[民86.01] |
頁 次 | 頁33-45 |
分類號 | 439.66 |
關鍵詞 | 泰國蝦; 酵母菌; Macrobrachium rosenbergii de mann; Candida sake; Candida famata; Yeast; |
語 文 | 英文(English) |
中文摘要 | 自民國83年起,我們研究台灣地區感染泰國蝦的酵母菌,發現感染大都發生在冬天(30%),夏天則無。在泰國蝦中,成蝦被感染的機率最高(73%),其次是中蝦(25%),幼蝦最少(2%)。泰國蝦被酵母菌感染的症狀是:蝦體黃褐色,肝胰臟腫脹,肌肉組織和血淋巴白色斑點化。組織切片呈現肝胰臟小葉空泡化,肌肉細胞頹壞,出芽生殖的酵母菌大量聚集於組織和血淋巴之間。計算酵母菌的感染菌數為:肝胰臟組織(9.26×10�蹝FUgm),肌肉組織(2.91×10�蹝FUgm),鰓組織(2.91×10�蹝FUgm)和血淋巴(1.79×10�嵩FUgm)。將一株感染的酵母菌鑑定為Candida sake,並做再感染實驗,證實Candida sake是致病株。 |
英文摘要 | During 1994 we investigated the prevalence of yeast infection in freshwater prawns (Macrobrachium rosenbergii de Mann) cultured in southern Taiwan. Most (30%) infections occurred during the winter (Dec.-Feb.), and none were found during the summer. The prevalences were highest in adults (73%) followed by juveniles (25%), and postlarvae (2%). No yeast infections were found in the larvae. The gross clinical signs of infection included: yellow-brown body coloration, swelling of the hepatopancreas, and a white cloudiness of muscle tissue and hemolymph. Histopathological examinations of affected tissues revealed extensive necrosis associated with large numbers of membrane-bound yeast aggregates. In addition, there were many vacuolized cells in the epithelium of the hepatopancreas. Budding yeast cells were abundant in the hemolymph. We isolated the yeast from various tissues, and numbers of yeast cells were: 9.2610 10 CFU (gm -1 ) in the hepatopancreas, 2.9110 10 CFU (gm -1 ) in muscle, 3.4910 8 CFU (gm -1 ) in the gills, and 1.7910 11 CFU (gm -1 ) in hemolymph. Two yeast species were identified as Candida sake and Candida famata. Experimental infection with the isolated yeast (Candida sake) produced a mortality rate of 100% when the culture temperature was 20°C. Histopathological results in experimentally infected, moribund prawns were essentially the same as those found in naturally infected prawns collected from ponds. |
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