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首页> 外文会议>NATO Advanced Research Workshop on Rescue on Sturgeon Species >THE URAL RIVER STURGEONS:POPULATION DYNAMICS, CATCH,REASONS FOR DECLINE AND RESTORATION STRATEGIES
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THE URAL RIVER STURGEONS:POPULATION DYNAMICS, CATCH,REASONS FOR DECLINE AND RESTORATION STRATEGIES

机译：乌拉尔河鲟鱼：人口动态，捕获，衰退和恢复策略的原因

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摘要

The Ural river, the third longest river in Europe, has the only remaining spawninghabitats in the entire Caspian basin for all sturgeon species. Unlike other large Europeanrivers the river's ecosystem has not been altered and the natural hydrological regime is stillintact. The Ural sturgeon yield-to-fishery relative to river discharge was the highest in theCaspian Sea till recently. The environmental conditions to secure natural reproduction arestill satisfactory for successful sturgeon reproduction. However, nowadays the catch in allregional sturgeon species is negligible. The Ural sturgeon population dynamics are analyzedalong with some anthropogenic and natural factors affecting them. It is argued that legaloverfishing (including all legal means of fish removal), based upon (a) faulty estimations ofsturgeon stock and catch limits and (b) inappropriate fishery policies are the principal reasonsfor the stock decline in the Ural. The maintenance of the natural reproduction in the Ural isconsidered to be the primary strategy for the stock replenishment. If used at all, artificialpropagation should be used only as an additional secondary option exclusively at thehistorical sturgeon habitats upstream the Ural river and not in the river delta, where thehatcheries are located now. Transboundary cooperation of basin countries with active inter-national involvement is essential to prevent further deterioration of the situation.
机译：乌拉尔河是欧洲第三个最长的河流，拥有整个鲟鱼盆地的唯一剩余的水稻鸟类。与其他大型欧洲不同，河流的生态系统没有改变，自然水文制度是无意的。乌拉尔鲟鱼相对于河流排放的渔业渔业是最近的最高的。为了成功的鲟鱼繁殖，保护自然繁殖的环境条件令人满意。然而，现在，Alleregional鲟鱼种类的捕获是可以忽略不计的。乌拉尔鲟鱼种群动态是分析的，具有影响它们的某些人为和自然因素。有人认为，合法钓鱼（包括所有法律手段的鱼类拆除），基于（a）urmergeon股票和捕获限制和（b）不适当的渔业政策是畜栏股权下降的主要原因。乌拉尔的自然复制的维护被认为是股票补充的主要策略。如果实际上，人为Propagation应该仅作为乌拉尔河上游的哈斯特罗科鲟鱼栖息地仅作为额外的次要选项，而不是在河边的河流中，现在是现在的。盆地国家跨界合作具有积极的国家民族参与，这对于防止情况进一步恶化至关重要。

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