Seasonal arrival patterns of juvenile freshwater eels (Anguilla spp.) in New Zealand
Seasonal arrival patterns of juvenile freshwater eels (Anguilla spp.) in New Zealand
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新西兰淡水鳗鱼（安圭拉属）幼鱼的季节性到达模式
DOI：
10.1080/00288330.1999.9516874
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发表时间：
1999
影响因子：
1.6
通讯作者：
J. Sykes
中科院分区：
文献类型：
--
作者：
D. Jellyman;B. Chisnall;M. Bonnett;J. Sykes
摘要 通过每隔 14 天对南北岛东海岸和西海岸的 13 条溪流/河流进行电捕，研究了两种新西兰淡水鳗鱼——短鳍鳗鱼（Anguilla australis (Richardson)）和长鳍鳗鱼（A. dieffenbachii (Gray)）玻璃鳗鱼的抵达季节。地点通常位于退潮时暴露的最下游浅滩，并通过单程电捕鱼进行采样。物种组成以短鳍鱼类为主，西海岸地区除外，北岛有 1 个，南岛有 2 个。通过对邻近流域的物种比例进行比较，得出的结论是，玻璃鳗会选择进入特定的水类型。随着抵达季节色素沉着阶段的推进，定义了“早期”玻璃鳗，并将其密度与季节抵达模式进行比较——密度通常在 8 月较低，9 月至 10 月最高，11 月至 12 月下降......
Abstract The arrival season of glass eels of both New Zealand species of freshwater eel, the short‐finned eel (Anguilla australis (Richardson)) and the longfmned eel (A. dieffenbachii (Gray)), was studied by electric fishing of 13 streams/rivers throughout east and west coasts of both North and South Islands at 14‐day intervals. Sites were usually located at the most downstream riffle exposed at low tide, and sampled by single‐pass electro fishing. The species composition was dominated by shortfins, with exceptions being west coast sites, one in the North Island and two in the South Island. From a comparison of species proportions in adjacent catchments, it was concluded that glass eels make choices about entry in particular water‐types. As the stage of pigmentation advanced during the arrival season, “early stage” glass eels were defined and densities of these compared to show seasonal arrival patterns—densities were generally low in August, highest in September‐October, and declined during November‐Dece...