Abstract ‘Trap and transport’ (T&T) is employed to facilitate the seaward migration of European eel (Anguilla anguilla) past obstacles such as hydropower facilities. Hence, previous studies assessing its efficacy have focussed on disrupted fluvial systems. The transferability of findings from lotic to lentic systems is uncertain because many of the environmental cues that trigger eel migration in rivers are lacking from reservoirs and lakes, particularly those with limited flow connection to the surrounding catchment. We used acoustic telemetry to compare the migration behaviour of T&T adult A. anguilla which were fyke netted and transported from two disconnected reservoirs (n = 80) to a control group of resident river eel (n = 30) during their migration through the lower River Stour, UK, to the North Sea. Migration patterns and behaviour were broadly similar between the reservoir T&T eel and river eel with 86 and 90 % of each group successfully reaching the sea, respectively. Reservoir eel were larger and at a more advanced stage of migratory readiness (silvering) and commenced migration sooner after release than the river eel, but they descended the catchment at a slower rate. Behaviour in the estuary was highly variable between individuals with residence times ranging from 5 h to 83 days (median = 1.4 days) across all groups. Only one individual failed to migrate through the estuary and most (75 %) reached the sea within five days of entering the estuary. Findings indicate that T&T of adult eel from reservoirs represents a feasible method to allow landlocked individuals to migrate and potentially contribute to the spawning stock, either now or in the future. Results also highlighted the high capture effort that may be required to implement an effective T&T programme. Gaining a thorough understanding of eel abundance and population structure in the source waterbody is desirable before implementation.

中文翻译：

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使用“陷阱和运输”促进内陆欧洲鳗（安圭拉安圭拉）从湖泊和水库向海迁移

摘要 '陷阱和运输' (T&T) 被用来促进欧洲鳗鱼 (Anguilla anguilla) 越过水电设施等障碍向海迁移。因此，先前评估其功效的研究集中在被破坏的河流系统上。水库和湖泊中缺乏引发鳗鱼迁移的许多环境因素，特别是与周围集水区水流连接有限的水库和湖泊，因此结果从流水系统到静态系统的可转移性尚不确定。我们使用声学遥测来比较 T&T 成年 A. anguilla 的迁移行为，它们在通过下游河流迁移期间从两个不相连的水库 (n = 80) 运输到对照组的常住河鳗 (n = 30)英国斯托尔，前往北海。水库鳗鲡和河鳗之间的迁移模式和行为大致相似，每组分别有 86% 和 90% 成功到达大海。水库鳗更大，处于更高级的洄游准备阶段（镀银），在放生后比河鳗更早开始洄游，但它们以较慢的速度下降到流域。在所有组中，停留时间从 5 小时到 83 天（中位数 = 1.4 天）不等的个体之间的河口行为差异很大。只有一个个体未能通过河口迁徙，大多数（75%）在进入河口后五天内到达大海。调查结果表明，对来自水库的成年鳗鱼进行 T&T 是一种可行的方法，可以让内陆个体迁移并可能对产卵种群做出贡献，无论是现在还是将来。结果还强调了实施有效的 T&T 计划可能需要大量的捕获工作。在实施之前，需要彻底了解源水体中鳗鱼的丰度和种群结构。