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首页> 外文期刊>Mycological Research >Saprolegnia diclina isolated from pond cultured red drum (Sciaenops ocellatus) in Hong Kong.
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Saprolegnia diclina isolated from pond cultured red drum (Sciaenops ocellatus) in Hong Kong.

机译：从香港池塘养殖的红色鼓（Sciaenops ocellatus）中分离出的腐烂菌。

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摘要

Mass mortality among pond cultured red drum (S. ocellatus) was observed in Hong Kong. Affected fish were lethargic and lost their appetite but no lesions on the body surface were apparent. Patches of white to brownish cottony growth on the gills ofaffected fish were observed and microscopic examination revealed mats of hyaline mycelia with mature zoosporangia and oogonia which were identified as Saprolegnia diclina. During induced sporulation, production of primary and secondary zoospores, oogonia, and antheridia were observed. A physiological study of the growth and sporulation of a representative isolate determined its optimum growth requirements. The isolate can grow from pH 4 to 10, in distilled water, at salinities of 5-30%, and temperaturesof 4-30deg C. Maximum growth was observed at pH 5 and 8-10, at salinities of 5-10%, and 25-30deg C. Production of zoosporangia only occurred in distilled water, 5 and 10% salinities, with zoospores released in distilled water and 5% salinity. Zoospore releasewas also observed from 4 to 30deg C with greater abundance at 25 and 30deg C, while oogonia and antheridia were produced in distilled water and from 5 to 30% salinities and at 20-30deg C.
机译：在香港观察到池塘养殖的红鼓（S. ocellatus）的大量死亡。受影响的鱼嗜睡，食欲不振，但在体表上未见明显病变。观察到在受影响的鱼的ill上有白色至褐色的棉状生长斑，并且显微镜检查显示出具有成熟的动物孢子囊和卵黄质的透明菌丝体垫，被鉴定为腐烂的腐烂菌。在诱导的孢子形成过程中，观察到初级和次级游动孢子，卵黄质和花粉症的产生。对代表性分离株的生长和孢子形成的生理研究确定了其最佳生长要求。在蒸馏水中，盐度为5-30％，温度为4-30摄氏度时，分离物的pH值可以从4增长到10。在pH值为5和8-10时，盐度为5-10％时，观察到最大的生长。 25-30℃。仅在蒸馏水，盐度为5％和10％的情况下才产生游动孢子虫，在蒸馏水中释放出游动孢子且盐度为5％。还观察到了游动孢子的释放，温度从4到30摄氏度，在25和30摄氏度时有更高的丰度，而在蒸馏水中和在5％到30％的盐度以及20到30摄氏度下产生了卵黄和花粉。

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