Ocean Research Institute, The University of Tokyo, Tokyo, Japan.
J Fish Biol. 2009 Mar;74(4):857-71. doi: 10.1111/j.1095-8649.2008.02167.x.
Using a longline survey, a total of 196 European eels Anguilla anguilla were collected at different depths in Lough Ennell (maximum depth 30 m), central Ireland. The catch per unit of effort of A. anguilla that were caught from 1 to 25 m depths was lowest at 0.5-5.0 m and greatest at the deepest depth range (22.5-25.0 m). Sub-samples of A. anguilla from depths of <15 m showed little or no difference in size, sex ratio, age, growth rate, condition factor, length-mass relationship, gonado-somatic index, fin index or eye index with fish from depths of >15 m. All fish examined were female yellow-phase A. anguilla that had ages from 7 to 20 years (mean +/-s.d. = 10.3 +/- 2.9 years), with growth rates from 24.0-60.8 mm year(-1) (mean +/-s.d. = 40.7 +/- 8.5 mm year(-1)). Variations in the growth rates were greater in the shallow group than that of the deep group. This study suggested that deeper regions are important feeding habitats for A. anguilla and that fish in this lake were growing moderately fast compared to similar habitats and areas in the species' range.
利用长线调查，在爱尔兰中部的埃纳隆湖（最大深度 30 米）的不同深度共采集了 196 条欧洲鳗 Anguilla anguilla。在 1 至 25 米深度范围内，A. anguilla 的单位捕捞努力量的捕捞量在 0.5-5.0 米处最低，在最深的深度范围内（22.5-25.0 米）最大。来自 <15 米深度的 A. anguilla 亚样本在大小、性别比例、年龄、生长率、条件因子、体长-体重关系、性腺-体指数、鳍指数或眼指数方面与来自 >15 米深度的鱼类几乎没有差异或没有差异。所有检查的鱼类均为 7 至 20 岁的雌性黄相 A. anguilla（平均 +/-s.d. = 10.3 +/- 2.9 岁），生长率为 24.0-60.8 毫米/年（平均 +/-s.d. = 40.7 +/- 8.5 毫米/年）。浅水区的生长率变化大于深水区。本研究表明，较深的区域是 A. anguilla 的重要觅食栖息地，与该物种分布范围内的类似栖息地和区域相比，该湖中鱼类的生长速度适中较快。
