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首页> 外文期刊>ICES Journal of Marine Science >Changes in fish stocks in an Estonian estuary: overfishing by cormorants?
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Changes in fish stocks in an Estonian estuary: overfishing by cormorants?

机译：爱沙尼亚河口鱼类种群的变化：cor过度捕捞？

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摘要

In Estonia, the cormorant Phalacrocorax carbo smensis is a newcomer, and its numbers have increased rapidly since 1985. In the shallow protected (no fishery) Kaeina Bay in Vaeinameri (West Estonia), the colony was established in 1995. Gillnet sampling indicated that roach was the most abundant spawning fish species in 1995. Ten years later, when the study was repeated, the catch per unit effort was already more than 100 times lower than in 1995. The number of spawning perch decreased tenfold from 1995 to 2005. During the same period, commercial fishing effort in the entire Vainameri area decreased several times. The change in fish abundance in the Kaina Bay and in the coastal fish-monitoring areas in the archipelago sea nearby, together with an analysis of food of cormor-ants, indicates that the decline in fish abundance might be related to the increased numbers of cormorants. The conclusion is drawn that the establishment of a cormorant colony could have seriously damaged or even prevented normal functioning of historically important spawning grounds and affected fish recruitment to adjacent areas. Therefore, expanding bird colonies might play a role similar to an expanding fishing fleet, by overexploiting the resource.
机译：在爱沙尼亚，car Ph刚刚出现，自1985年以来数量迅速增加。在Vaeinameri（西爱沙尼亚）的浅水保护区（无渔业）Kaeina湾，该殖民地于1995年建立。G网抽样表明有蟑螂是1995年最丰富的产卵鱼类。十年后，当重复进行这项研究时，单位产值捕获量已经比1995年降低了100倍以上。从1995年到2005年，产卵鲈的数量减少了十倍。同期，整个瓦纳梅里地区的商业捕鱼活动减少了数倍。凯纳湾和附近群岛海中沿海鱼类监测区的鱼类丰度变化，以及对cor类食物的分析表明，鱼类丰度的下降可能与cor类数量的增加有关。得出的结论是，建立a殖民地可能会严重破坏甚至阻止历史上重要的产卵场的正常运转，并影响鱼类向邻近地区的募集。因此，通过过度开发资源，扩大鸟类殖民地可能起到与扩大捕捞船队相似的作用。

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  • 来源
    《ICES Journal of Marine Science》 |2010年第9期|p.1972-1979|共8页
  • 作者

    Markus Vetemaa; Redik Eschbaum; Anu Albert; Lauri Saks; Aare Verliin; Kristiina Juergens; Martin Kesler; Kalvi Hubel; Roegnvaldur Hannesson; Toomas Saat;

  • 作者单位

    Estonian Marine Institute, University of Tartu, Vanemuise 46, 57074 Tartu, Estonia;

    rnEstonian Marine Institute, University of Tartu, Vanemuise 46, 57074 Tartu, Estonia;

    rnEstonian Marine Institute, University of Tartu, Vanemuise 46, 57074 Tartu, Estonia;

    rnEstonian Marine Institute, University of Tartu, Vanemuise 46, 57074 Tartu, Estonia;

    rnEstonian Marine Institute, University of Tartu, Vanemuise 46, 57074 Tartu, Estonia;

    rnEstonian Marine Institute, University of Tartu, Vanemuise 46, 57074 Tartu, Estonia;

    rnEstonian Marine Institute, University of Tartu, Vanemuise 46, 57074 Tartu, Estonia;

    rnEstonian Marine Institute, University of Tartu, Vanemuise 46, 57074 Tartu, Estonia;

    rnNorwegian School of Economics and Business Administration, Helleveien 30, 5045 Bergen, Norway;

    rnEstonian Marine Institute, University of Tartu, Vanemuise 46, 57074 Tartu, Estonia;

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  • 正文语种 eng
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  • 关键词

    baltic sea; effect of cormorants; perca fluviatilis; phalacrocorax carbo sinensis; rutilus rutilus;

    机译：波罗的海;of的作用;Salmo salar;中华coal发光的红色;

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