Helmoltz-Centre for Ocean Research (GEOMAR), Kiel, Germany.
J Fish Biol. 2013 Feb;82(2):686-99. doi: 10.1111/jfb.12032. Epub 2013 Jan 24.
To investigate the extent to which European silver eels Anguilla anguilla, originating from stocking programmes in the Baltic Sea tributaries, effectively contribute to the spawning stock, two hundred and seventy-four formerly stocked A. anguilla. emigrating from the Schwentine River near Kiel, Germany, were tagged with T-Bar anchor tags. A total of 29 Anguilla spp. were recaptured (c. 11%) up to 14 months after release. Stocking history of recaptured A. anguilla. was confirmed by otolith microchemistry. Recapture locations were concentrated around the outlet of the Baltic Sea (Danish Belt Sea) with 62% of all recaptures reported here or in the Kattegat. Recaptured Anguilla spp. showed a reduction in both L(T) and mass (mean ± s.d. = -1.5 ± 0.9 cm and -125.3 ± 50.1 g) while average total fat content remained in the order of values previously reported as high enough to provide energy resources to allow successful completion of the spawning migration (mean ± s.d. = 28.4 ± 4.4%). The documented mean rate of travel (0.8 km day(-1)), however, indicated a delay in the target-oriented migration that might be interpreted as a delayed initial migration phase of orientation towards the exit of the Baltic Sea.
为了研究源自波罗的海支流放养计划的欧洲银鳗 Anguilla anguilla 在多大程度上有效地为产卵种群做出贡献，德国基尔附近 Schwentine 河有 274 条曾放养的 A. anguilla. 被 T 型锚标签标记。在释放后长达 14 个月的时间里，共捕获了 29 条 Anguilla spp.（约 11%）。通过耳石微化学确认了回捕 A. anguilla. 的放养历史。回捕地点集中在波罗的海（丹麦 belt 海）出口附近，其中 62%的回捕报告在这里或卡特加特报告。回捕的 Anguilla spp. 的 L(T)和质量都有所减少（平均值±标准差=-1.5±0.9cm 和-125.3±50.1g），而平均总脂肪含量仍保持在先前报道的足以提供能量资源以允许成功完成产卵洄游的范围内（平均值±标准差=28.4±4.4%）。然而，记录的平均迁移率（0.8 公里/天）表明目标导向的迁移出现了延迟，这可能被解释为对波罗的海出口的初始迁移阶段的定向延迟。
