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Identification of an isolate of Saprolegnia ferax as the causal agent of saprolegniosis of Yellow catfish (Pelteobagrus fulvidraco) eggs

文献类型： 外文期刊

作者： Cao, Haipeng 1 ; Zheng, Weidong 2 ; Xu, Jialu 1 ; Ou, Renjian 1 ; He, Shan 1 ; Yang, Xianle 1 ;

作者机构： 1.Shanghai Ocean Univ, Natl Pathogen Collect Ctr Aquat Anim, Key Lab Explorat & Utilizat Aquat Genet Resources, Shanghai 201306, Peoples R China

2.Chinese Acad Fishery Sci, Yangtze River Fisheries Res Inst, Wuhan 430223, Peoples R China

关键词： Saprolegnia ferax;Causal agent;Phylogenetic analysis;Yellow catfish egg;Saprolegniosis

期刊名称：VETERINARY RESEARCH COMMUNICATIONS （ 影响因子：2.459； 五年影响因子：2.352 ）

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收录情况： SCI

摘要： Saprolegnia species have been implicated for significant fungal infections of both living and dead fish as well as their eggs. In the present study, an oomycete water mould (strain HP) isolated from yellow catfish (Peleobagrus fulvidraco) eggs suffering from saprolegniosis was characterized both morphologically and from ITS sequence data. It was initially identified as a Saprolegnia sp. isolate based on its morphological features. The constructed phylogenetic tree using neighbour joining method indicated that the HP strain was closely related to Saprolegnia ferax strain Arg4S (GenBank accession no. GQ119935), that had previously been isolated from farming water samples in Argentina. In addition, the zoospore numbers of strain HP were markedly influenced by a variety of environmental variables including temperature, pH, formalin and dithiocyano-methane. Its zoospore formation was optimal at 20 degrees C and pH7, could be well inhibited by formalin and dithiocyano-methane above 5 mg/L and 0.25 mg/L, respectively. To our knowledge, this is the first report on the S. ferax infection in the hatching yellow catfish eggs.

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