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《Journal of Southern Agriculture》 2015-04
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Control effect of Ridomil on saprolegniasis infected Discus fish(Symphysodon aequifasciatus) zygotes

Li Hao-ran;Ou Ren-jian;Qiu Jun-qiang;Guo Wei-wei;Yang Xian-le;Hu Kun;National Pathogen Collection Center for Aquatic Animals,Shanghai Ocean University;  
【Objective】The present experiment was conducted to study safety and control effect of Ridomil on saprolegniasis of Symphysodon aequfasciatus zygote, in order to provide scientific basis for prevention and treatment of saprolegniasis during artificial incubation of fish. 【Method】The antibacterial effect of Ridomil on saprolegniasis in vitro was verified by using multiple proportion dilution. By means of water bath, S. aequfasciatus zygote was infected by Saprolegnia. Then the infected zygotes were exposed to different concentrations of Ridomil, malachite green of 0.1 mg/L(positive control) and water(blank control), respectively. The zygote development of different drug treatments were observed to calculate zygote mortality, hatchability and infection rate of Saprolegnia. 【Result】The results showed that, Ridomil(8.0 mg/L) and malachite green(0.10 mg/L) could significantly inhibit the hypha growth of Saprolegnia. Both the zygotes fertilized after 36 h and the zygotes fertilized within 3 h were soaked in 8.0 mg/L Ridomil, the infection rate of Saprolegnia and zygote mortality were found to be extremely significantly reduced(P0.01) or significantly reduced(P0.05), while hatchability of zygote was found to be significantly increased. The tissue section of zygote showed that the compact structure of fish zygote was found out from blank control group. While the internal structure of zygote in positive control group was loose, dissolved and broken. As for Ridomil group of 8.0 mg/L, its internal structure of zygote did not change obviously. 【Conclusion】Ridomil can prevent and treat saprolegniasis of fancy fish, which have not toxic effect on fish zygote. The recommendation concentration of Ridomil is 8.0 mg/L in the production.
【Fund】: 国家“863”计划项目(2011AA10A216);; 公益性行业(农业)科研专项项目(201203085);; 上海市科技兴农重点攻关项目(沪农科攻字[2011]第4-8号);; 上海海洋大学研究生科研基金项目(A-0209-13-0900029)
【CateGory Index】: S941.431
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