The effect of oceanic environmental conditions on the recruitment of American Eel Anguilla rostrata to coastal waters is poorly understood. This study examined correlations between the annual elver count index of the East River, Chester, Nova Scotia, seasonal oceanic environmental conditions associated with the larval and glass eel stages, and larval and glass eel migration times between the spawning area and continental recruitment. In recent years, the elver fishery of the East River has started earlier in conjunction with increasing inshore, continental shelf, and Gulf Stream water temperatures, with the strength of the correlation decreasing with distance from shore. A northward shift of the Gulf Stream may also have contributed to earlier arrival dates. Annual elver index values increased over the study period but were not significantly correlated with any atmospheric or oceanic environmental conditions, perhaps due to a relatively short time series, although effect sizes (correlation coefficient r) were often medium, a level potentially considered of biological importance. Elver mean lengths varied annually with no trend and were not significantly correlated with the elver index. Significant correlations occurred between the North Atlantic Oscillation and Sargasso Sea primary productivity (lag of 0) and Emerald Basin (Scotian Shelf) water temperatures (lag of –5), while Scotian Shelf chlorophyll values decreased with increasing water temperatures (lag of –3). The mean migration period from spawning to stream entrance at the East River was estimated at 1.2 years, mostly spent growing in and ultimately leaving the Sargasso Sea, then crossing oceanic and continental shelf waters between the Gulf Stream and coastal streams, with a short period of transport along the Gulf Stream. The estimate of total migration period based on observed recruitment times at various sites and the mean of the estimated spawning period averaged 45.5% greater than those estimated from otolith methods, perhaps due to the effect on otolith daily ring deposition during glass eel migration in oceanic water temperatures <10ºC between the Gulf Stream and coast.

中文翻译：

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海洋环境对新斯科舍省切斯特的美国东部鳗鱼鳗鱼招募的影响

大洋环境条件对美洲鳗的招聘效果安圭拉喙对沿海水域了解甚少。这项研究检查了东河，切斯特，新斯科舍省的年度鳗鱼计数指数，与幼体和玻璃鳗阶段有关的季节性海洋环境条件，以及产卵区与大陆募集之间的幼体和玻璃鳗迁移时间之间的相关性。近年来，随着近岸，大陆架和墨西哥湾流水温的升高，东方河的高级渔业已经开始较早，相关强度随距岸的距离而减小。墨西哥湾流的北移也可能是导致较早到达的原因。在研究期间，年度埃尔弗指数值增加，但与任何大气或海洋环境条件均无显着相关性，[R）通常是中等水平，可能被认为具有生物学重要性。Elver平均长度每年变化，没有趋势，并且与Elver指数没有显着相关。北大西洋涛动与Sargasso海初级生产力（滞后0）和翡翠盆地（斯科蒂尔搁板）水温（滞后–5）之间存在显着相关性，而斯科蒂尔架子叶绿素值随水温升高而降低（滞后–3）。 。据估计，从东河产卵到小河入口的平均迁移期为1.2年，大部分时间是在萨加索海中生长并最终离开萨尔加索海，然后在海湾小溪和沿海小溪之间越过海洋和大陆架水域，时间较短。沿墨西哥湾流运输。