排序方式: 共有28条查询结果,搜索用时 15 毫秒
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针对低洼盐碱地池塘水质特点,做好水质调控,是提高池塘单产、增加农民收入的有效途径。笔者在陕西省大荔县沿黄开展低洼盐碱地渔业综合利用关键技术试验推广,取得较好效果,现就其中水质调控技术试验进行分析总结。 相似文献
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通过了解大鲵虹彩病毒(Giant salamander iridovirus,GSIV)在EPC细胞接毒情况和PCR的实际检测情况,为大鲵的病毒检测提供必要判断依据和检测方法.通过细胞接毒和组织分离分别提取病毒质粒,进行普通PCR扩增,电泳分析,比较病毒细胞培养和组织直接提取结果.Gsiv病毒体外培养:经传代48 h的EPC细胞,25℃培养,12h后可观察到CPE出现,24 h病变明显,CPE达15%,48 h后CPE可达70%,72 h后细胞完全脱落;PCR检测:对3个样本分别从组织提取和经细胞扩增分离的病毒进行普通PCR扩增检测,经细胞培养扩增的3个样本全部呈阳性;经组织提取的3个样本,2个呈阳性,一个呈阴性;电泳观察,病毒的扩增产物在500 bp左右.在体外环境下GSIV是高病力的一种病毒,对EPC细胞在25℃时效应时间为3d,普通PCR经组织的检出率低,经细胞培养扩增可提高检出率但耗时久,不利于实际生产中快速、准确诊断疫情的需要. 相似文献
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黄河干流中上游水生生物资源调查研究 总被引:19,自引:1,他引:18
In order to protect scientifically the fishery resources and eco-environment of Yellow River , nine investigatioins on hydrobios in the middle and upper reaches of main Yellow River had been carried out since 2002 according to The Standard for the investigation of inland fishery resources. The investigations showed the present status of the fishery resources in these reaches are as follows :87species (genera)and 8 phylum of phytoplankton,42 species and 6 phylum of zooplankton, 14 species(genera) of banthic organism , 5 species of hydroplant, 38 species of fish. A comparative analysis,With the results of "the Yellow River Fishery Resources Survey in 1982",shows that the general trend of the plankton is that the average biomass is getting apparently decreased, the aboriginal fishes are endangered intensifically, and there must be some problem of aquatic biological invasion in these reaches. A granual miniaturization of fishes in main Yellow River has been noticed. The authors proposed to carry out investigation and researches on hydrobios resources in main Yellow River , and develop plans to protect the fishery resources in yellow River, which will be an important basis for rehabilitation of the Yellow River waters and it's ecological environment, for the maintenance of biological diversity of Yellow River's waters. And this work will be of great significance for people's life and sustainable development of economics in Yellow River basin. 相似文献
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陕西沿黄池塘不同轮捕轮放模式的效益分析 总被引:1,自引:0,他引:1
轮捕轮放是我国劳动人民通过长期渔业生产实践总结的增产措施之一,早在20世纪60年代科技工作者系统地总结了我国淡水养鱼基本经验,提出并制定了“水、种、饵、密、混、轮、防、管”的池塘养鱼“八字”方针,为大面积高产提供了重要的技术指导和理论依据。其中的“轮”系指“轮捕轮放”技术。笔者就陕西渭南沿黄地区生产实践中实施的几种不同轮捕轮放模式进行对比分析。 相似文献
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为了解复合芽孢杆菌微生态制剂对克氏原螯虾(Procambarus clarkii)养殖池塘水质及螯虾成活率的影响,设计了3组试验塘(使用复合芽孢杆菌)和3组对照塘(未使用复合芽孢杆菌)进行92d的养殖对比试验。结果表明,试验塘总体水质优于对照塘,与对照池相比,试验池氨氮含量显著降低了69.6%,亚硝酸盐含量显著减少了54.5%,透明度显著降低了23.5%,pH值和电导率变化显著(P<0.05),试验塘克氏原螯虾成活率显著提高了12.8%,养成规格显著增加了27.8%,生长率显著高于对照塘(P<0.05)。研究表明,浓缩复合芽孢杆菌微生态制剂对养虾池塘的水质具有一定的净化效果,并可通过调节螯虾免疫系统减少病害发生,提高螯虾养殖成活率。 相似文献
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