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首页> 外文期刊>Journal of Environmental Protection and Ecology >RESEARCHES REGARDING THE MIGRATION OF THE DANUBE SHAD
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RESEARCHES REGARDING THE MIGRATION OF THE DANUBE SHAD

机译：关于DANUBE SHAD迁移的研究

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摘要

The Danube shad (Alosa pontica Eichwald, 1838) is a migratory species having a spread area, which covers the Black Sea basin and the lower Danube river. The shad population is made up of all age classes which live, feed and spend the winter in the south-western Black Sea. A component part of the population is made up of the brood stock which migrates in the river, and another component part includes the juvenile which migrate from the Danube river into the Black Sea. The biological material resulted from the fishing carried out for scientific and industrial purpose in the Danube river was used in order to get the necessary data. The study on Danube shad migration was based on the samples defining its spread in time and space. The following parameters were entered in the records for each test sample: total length, body length, weight, sex and age (by examining scales). It is certified the hypothesis that the preferred places for reproduction of the Danube shad are mainly located between Braila and Calarasi. The length frequency has the aspect of the histogram specific to a normal distribution of an only one class, as a result of the domination of 2-year old generation, followed by the 4-year generation and the fact that the migration takes place when the specimens have reached sexual maturity, expressed by the dimensions of migration and amount of fats, necessary for energetic loss during migration. The dimensions average, after the sampling in the analysed period reflects the size of specimens that migrates at a time and not the entire population.
机译：多瑙河sha鱼（Alosa pontica Eichwald，1838年）是一种迁徙物种，具有扩散区域，覆盖黑海盆地和多瑙河下游。 d鱼种群由在西南黑海生活，喂养和度过冬天的所有年龄段组成。人口的一部分由在河中迁移的亲鱼种群组成，另一部分包括从多瑙河迁移至黑海的幼鱼。为了获得必要的数据，使用了在多瑙河中出于科学和工业目的捕鱼而获得的生物材料。对多瑙河sha鱼迁移的研究基于确定其在时间和空间扩散的样本。对于每个测试样品，在记录中输入以下参数：全长，体长，体重，性别和年龄（通过检查体重秤）。证实了这样一个假说，即多瑙河sha鱼繁殖的首选地点主要位于Braila和Calarasi之间。长度频率具有直方图的特征，该直方图特定于仅一个类别的正态分布，这是由于2岁的一代人占主导地位，随后是4岁的一代人以及在标本已达到性成熟，用迁移的大小和脂肪的量表示，这是迁移过程中精力充沛所必需的。在分析期间进行抽样后，平均尺寸反映的是一次迁移的样本的大小，而不是整个种群的大小。

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  • 来源
    《Journal of Environmental Protection and Ecology》 |2011年第4期|p.1759-1765|共7页
  • 作者

    V. IORGA; V. CRISTEA; N. PATRICHE; T. PATRICHE; A. TROFIMOV; C. MOCANU; M. MOCANU; E. BOCIOC; M. T. COADA;

  • 作者单位

    Institute of Research and Development for Aquatic Ecology, Fishing and Aquaculture, 54 Portului Street, 800 211 Galati, Romania;

    Dunarea de Jos' University, 47 Domneasca Street, 800 008 Galati, Romania;

    Institute of Research and Development for Aquatic Ecology, Fishing and Aquaculture, 54 Portului Street, 800 211 Galati, Romania;

    Dunarea de Jos' University, 47 Domneasca Street, 800 008 Galati, Romania;

    Institute of Research and Development for Aquatic Ecology, Fishing and Aquaculture, 54 Portului Street, 800 211 Galati, Romania;

    Institute of Research and Development for Aquatic Ecology, Fishing and Aquaculture, 54 Portului Street, 800 211 Galati, Romania;

    Institute of Research and Development for Aquatic Ecology, Fishing and Aquaculture, 54 Portului Street, 800 211 Galati, Romania;

    Dunarea de Jos' University, 47 Domneasca Street, 800 008 Galati, Romania;

    Dunarea de Jos' University, 47 Domneasca Street, 800 008 Galati, Romania;

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  • 正文语种 eng
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  • 关键词

    the danube shad; migration; temperature;

    机译：多瑙河sha移民;温度;

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