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<p>The migrations of adult fish of the cyprinid species chub (<i>Squalius cephalus</i>), nase (<i>Chondrostoma nasus</i>) and barbel (<i>Barbus barbus</i>) were studied over one year using radio telemetry at a&#xa0;chain of 5&#xa0;medium-sized run-of-river power plants on the Mur river in southern Styria (Austria). The power plants each have 2&#xa0;Kaplan turbines, intake screens with a&#xa0;clear width of 10 cm, and discharge flows of 200–260 m<sup>3</sup>/s. Downstream migration across power plants took place all year round. The increased migration activity in early summer can be interpreted as post-spawning migration. For the 216 fish studied, an average of 0.63 downstream and 0.48 upstream passages were found, with comparatively little difference between the species. Only the fishways can be used for the upstream migrations. The route used for the downstream passages (turbines, weirs or fishways) could be partially determined on the basis of the signal patterns and weir opening. Passages both via the turbines (at least 27%, maximum 62%) and via fish migration aids (at least 38%) play a&#xa0;significant role, the proportion of passages via the weir was low. Combining the annual descent rate with the proportion of turbine passages, this results in a&#xa0;mean value of 0.28 turbine passages per year. The recorded mobility reflects the situation in a&#xa0;structurally poor chain of comparatively small impoundments. The results serve as a&#xa0;basis for modelling the influence of turbine-related impacts on populations of potamodromous fish species.</p>

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Wanderungen potamodromer Cypriniden in einer Kraftwerkskette und Nutzung verschiedener Abstiegswege

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年7月16日

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  • Clemens Ratschan,
  • Maximilian Zauner,
  • Gerald Zauner,
  • Andreas Zitek,
  • Martin Schletterer,
  • Walter Reckendorfer,
  • Josef Schneider

摘要

The migrations of adult fish of the cyprinid species chub (Squalius cephalus), nase (Chondrostoma nasus) and barbel (Barbus barbus) were studied over one year using radio telemetry at a chain of 5 medium-sized run-of-river power plants on the Mur river in southern Styria (Austria). The power plants each have 2 Kaplan turbines, intake screens with a clear width of 10 cm, and discharge flows of 200–260 m3/s. Downstream migration across power plants took place all year round. The increased migration activity in early summer can be interpreted as post-spawning migration. For the 216 fish studied, an average of 0.63 downstream and 0.48 upstream passages were found, with comparatively little difference between the species. Only the fishways can be used for the upstream migrations. The route used for the downstream passages (turbines, weirs or fishways) could be partially determined on the basis of the signal patterns and weir opening. Passages both via the turbines (at least 27%, maximum 62%) and via fish migration aids (at least 38%) play a significant role, the proportion of passages via the weir was low. Combining the annual descent rate with the proportion of turbine passages, this results in a mean value of 0.28 turbine passages per year. The recorded mobility reflects the situation in a structurally poor chain of comparatively small impoundments. The results serve as a basis for modelling the influence of turbine-related impacts on populations of potamodromous fish species.