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首页> 外文期刊>Ecology of Freshwater Fish >Marine migrations in anadromous brown trout (Salmo trutta). Fjord residency as a possible alternative in the continuum of migration to the open sea
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Marine migrations in anadromous brown trout (Salmo trutta). Fjord residency as a possible alternative in the continuum of migration to the open sea

机译：海洋迁移到褐鳟（Salmo trutta）中。峡湾地区的居民身份可能是向公海迁移的连续过程中的一种可能选择

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Partial migration is a common phenomenon in many fish species. Trout (Salmo trutta) is a partially migratory species where some part of the population migrate to the marine environment, while another remains in freshwater. In the years 2008 and 2009, a total of 159 wild sea trout smolts were tagged with acoustic and PIT-tags in the river Villestrup (Denmark) to study the initial postsmolt marine behaviour within a fjord system. We found that the strategies of the sea migrants vary: some stay in the fjord, while others migrate to the sea, suggesting that partial migration occurs even in the marine environments. Overall, a total of 53% of the tagged smolts migrated from the fjord to the sea, and 47% stayed (or potentially died) in the fjord. The ratios of fjord-resident versus seamigrating postsmolts were consistent at the study times, and no differences between the early and late migration periods of the smolts were observed. The individual's size or body condition at the time of tagging did not affect survival or the migratory decisions in the fjord. High overall initial survival (74%) was found 30 days after the fjord entry. We suggest that within a continuum of migration to sea, there is a migratory decision point when sea trout postsmolts encounter a fjord system. At this point, postsmolts will assess the possibility of migration versus the alternative of fjord residency.
机译：在许多鱼类中，部分迁移是一种普遍现象。鳟鱼（Salmo trutta）是部分迁徙物种，其中一部分人口迁移到海洋环境，而另一部分则保留在淡水中。在2008年和2009年，总共有159只野生鳟鱼在Villestrup河（丹麦）上贴上了声学标签和PIT标签，以研究峡湾系统内最初的蜕皮后海洋行为。我们发现海上移民的策略各不相同：有些人留在峡湾，而另一些移民到海中，这表明即使在海洋环境中也会发生部分移民。总体而言，总共有53％的带标签的小鲑鱼从峡湾迁移到大海，而47％的鸟栖在峡湾（或可能死亡）。在研究期间，峡湾居民与海迁移后蜕皮的比例是一致的，并且在该迁徙的早期和晚期迁移期间之间没有观察到差异。标记时个人的身材或身体状况不会影响峡湾的生存或迁徙决定。峡湾进入后30天发现总体总体生存率较高（74％）。我们建议，在连续迁移到海上的过程中，当海鳟后蜕皮遇到峡湾系统时，会有一个迁徙的决策点。在这一点上，后蜕皮者将评估迁徙的可能性，而不是峡湾居住地的可能性。

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