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<p>For successful reproduction, the lake-run brown trout <i>(Salmo trutta)</i> must be able to migrate from the lake to the tributaries, where it reproduces on gravelly substrate. The influence of environmental parameters on the spawning migration have so far been barely researched. In the present study, this was investigated for the first time in an alpine stream, that is not influenced by hydropower. For this purpose, a temporary video monitoring system was installed in the Lütschine and the Weisse Lütschine in the Bernese Highlands in order to systematically investigate the spawning migration over an entire spawning period. The survey period of 169 days and nights lasted from 09.09.2022 to 24.02.2023. A total of 89 lake running brown trout movements were recorded. The population size of lake-run brown trout in the Lütschine-system during the 2022/23 spawning season was estimated at 60-120 spawners based on this survey. The main spawning season lasts from mid-October to the end of November. It was found that, in addition to discharge, water temperature and air pressure have the greatest influence on the migration. This is consistent with the findings from the residual water section of the Hasliaare <CitationRef CitationID="CR2542">[8]</CitationRef>, <CitationRef CitationID="CR2550">[10]</CitationRef>. Furthermore, 91 % of movements were recorded at dusk or in the dark, which clearly shows that this fish species prefers to migrate at night.</p>

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Laichmigration der Lütschine-Seeforellen - Einfluss abiotischer Parameter

  • 期刊论文

  • 发表日期：

    2025年5月6日

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  • Maurus Meier,
  • Basil Wagner,
  • Matthias Meyer,
  • Steffen Schweizer,
  • Andreas Hertig,
  • Erwin Lautsch,
  • Michael Döring

摘要

For successful reproduction, the lake-run brown trout (Salmo trutta) must be able to migrate from the lake to the tributaries, where it reproduces on gravelly substrate. The influence of environmental parameters on the spawning migration have so far been barely researched. In the present study, this was investigated for the first time in an alpine stream, that is not influenced by hydropower. For this purpose, a temporary video monitoring system was installed in the Lütschine and the Weisse Lütschine in the Bernese Highlands in order to systematically investigate the spawning migration over an entire spawning period. The survey period of 169 days and nights lasted from 09.09.2022 to 24.02.2023. A total of 89 lake running brown trout movements were recorded. The population size of lake-run brown trout in the Lütschine-system during the 2022/23 spawning season was estimated at 60-120 spawners based on this survey. The main spawning season lasts from mid-October to the end of November. It was found that, in addition to discharge, water temperature and air pressure have the greatest influence on the migration. This is consistent with the findings from the residual water section of the Hasliaare [8], [10]. Furthermore, 91 % of movements were recorded at dusk or in the dark, which clearly shows that this fish species prefers to migrate at night.