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首页> 外文期刊>Estuarine Coastal and Shelf Science >Routes and survival of anadromous brown trout Salmo trutta L. post-smolts during early marine migration through a Danish fjord system
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Routes and survival of anadromous brown trout Salmo trutta L. post-smolts during early marine migration through a Danish fjord system

机译：通过丹麦峡湾系统进行的早期海洋迁徙过程中，褐鳟鳟鱼的蜕皮途径和生存

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摘要

We examined the survival and progression rates of 101 anadromous brown trout Salmo trutta L. post-smolts from two Danish river systems, Karup and Simested, with acoustic telemetry as they migrated through a large Danish fjord system (the Limfjord). No fish were documented to residualize permanently within the fjord, and the minimum survival in the fjord was low (26%) while the mortality per km of migrated linear distance (0.8% km(-1)) was similar to that found in adjacent and smaller Danish fjords. Survival was positively correlated with length (P = 0.003) but not with condition and river of origin. The fjord has an eastern outlet into the Kattegat and a western outlet into the North Sea, but the western outlet did not exist until 1825. No fish left the fjord in the western direction in the study and all surviving fish (n = 20) left the fjord in the eastern direction. The results suggest that fish from rivers Karup and Simested may have over time become adapted for leaving the Limfjord in the eastern direction and that predation rates and environmental characteristics of the fjord are more important for the fjord's ability to function as a suitable growth habitat for post-smolts than size and the availability of food within it.
机译：我们通过两个遥远的丹麦峡湾系统（Limfjord）进行声遥测，研究了来自两个丹麦河流系统Karup和Simested的101尾褐鳟鳟鱼的生存和进展率。没有任何鱼类被记录在峡湾内永久残留，峡湾的最低生存率很低（26％），而每迁徙线性距离的死亡率（0.8％km（-1））与附近和附近的死亡率相似。较小的丹麦峡湾。存活率与长度呈正相关（P = 0.003），但与状况和起源河没有正相关。峡湾有一个通往Kattegat的东部出口和一个通往北海的西部出口，但是直到1825年，该西部出口才存在。在研究中，没有鱼向西方向离开峡湾，并且所有存活的鱼（n = 20）都离开了东峡湾。结果表明，随着时间的流逝，来自Karup和Simested河流的鱼类可能已经适应了向东离开Limfjord的趋势，而峡湾的捕食率和环境特征对于峡湾作为合适的生境栖息地的能力更为重要。 -比大小和其中的食物供应量多。

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