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首页> 外文期刊>ICES Journal of Marine Science >Age, growth, and condition of European eel (Anguilla anguilla) from six lakes in the River Havel system (Germany)
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Age, growth, and condition of European eel (Anguilla anguilla) from six lakes in the River Havel system (Germany)

机译：哈弗尔河系统（德国）中六个湖泊的欧洲鳗鱼（安圭拉鳗鱼）的年龄，生长和状况

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摘要

A total of 199 female yellow European eels (Anguilla anguilla), 21.6-66.2 cm long and 3-14 years old, was collected by electro-fishing from six lakes in the River Havel system (Germany) in spring 2001. The condition and the growth rate, estimated by otolith increments, varied between eels within single lakes and between lakes. Fulton's condition factor ranged from 0.10 to 0.24 and the gross energy content varied between 4.3 and 15.3 MJ kg~(-1). There were no significant differences in mean condition factor (0.16-0.18) or gross energy content (6.5-9.3 MJ kg~(-1)) between lakes. Fastest growth was in Lake Blankensee (mean 5.3 cm year~(-1)), and the slowest in Lake Sacrow (mean 4.0 cm year~(-1)). For all lakes combined, the overall mean annual increment was estimated to be 4.5 cm year~(-1). The biggest annual increment on the otoliths was generally laid down during the first and second years in fresh water, when the growth rate was 6.1 -8.5 cm year~(-1). Then, in the subsequent 12 years, the annual increment remained almost constant or decreased slightly (with lake-dependent values of between 1.6 and 6.8 cm year~(-1)). In the River Havel system, the time between stocking of the lakes with glass eels and the recapture of eels at 45 cm body length was 7-10 years. The physiologically possible maximum length (L_∞ values) of eels lay in the range 50-130 cm. In comparison with previous investigations (between the 1950s and the 1970s), the only difference observed was a trend towards slower growth.
机译：2001年春季，通过电捕鱼法从哈弗尔河系统（德国）的六个湖中收集了199只欧洲黄鳗鱼（安圭拉安圭拉），长21.6-66.2厘米，年龄3-14岁。通过耳石增量估算的生长速度在单个湖泊内的鳗鱼之间以及湖泊之间的鳗鱼之间变化。富尔顿的条件因子范围从0.10到0.24，总能量含量在4.3到15.3 MJ kg〜（-1）之间变化。湖泊之间的平均条件因子（0.16-0.18）或总能量含量（6.5-9.3 MJ kg〜（-1））没有显着差异。生长最快的是布兰肯塞湖（平均5.3 cm年〜（-1）），最慢的是塞克罗湖（平均4.0 cm年〜（-1））。对于所有湖泊，总的平均年增量估计为4.5 cm年〜（-1）。耳石上的最大年增量通常在淡水的第一和第二年内确定，当时增长率为6.1 -8.5 cm年〜（-1）。然后，在随后的12年中，年增量几乎保持不变或略有下降（与湖泊有关的值在1.6至6.8 cm年〜（-1）之间）。在哈弗哈维尔河系统中，从湖中放养玻璃鳗到重新捕获45厘米长的鳗鱼的时间为7-10年。鳗鱼的生理上可能的最大长度（L_∞值）在50-130 cm之间。与以前的研究（在1950年代和1970年代之间）相比，观察到的唯一区别是增长趋缓。

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