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<p>Injury and survival to the fish species chub (<i>Squalius cephalus</i>), nase (<i>Chondrostoma nasus</i>) and grayling (<i>Thymallus thymallus</i>) during passage through Kaplan turbines was estimated using HI‑Z Tag techniques at two medium-sized run-of-river hydropower plants. Survival rates (48 h) of juvenile fish were between 87&#xa0;and 94% and for adult fish were between 75&#xa0;and 90%. The mortality is comparable with results for Kaplan turbines from the literature and is lower than those of small hydropower plants. The lower mortality at the Mur power plant compared to the Drau power plant can plausibly be explained by a&#xa0;lower number of turbine blades (4&#xa0;instead of&#xa0;5), a&#xa0;lower hydraulic head and a&#xa0;slightly slower turbine runner speed. The proportion of injury varied species-specifically, with higher external injury rates in adult nase than in chub and and increased loss of equilibrium in juvenile grayling.</p>

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Erhebung der Schädigung von Fischen beim Durchgang von Kaplan-Turbinen mittelgroßer Kraftwerksanlagen

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年6月18日

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  • Clemens Ratschan,
  • Cory Hoffman,
  • Maximilian Zauner,
  • Gerald Zauner,
  • Andreas Zitek,
  • Josef Schneider

摘要

Injury and survival to the fish species chub (Squalius cephalus), nase (Chondrostoma nasus) and grayling (Thymallus thymallus) during passage through Kaplan turbines was estimated using HI‑Z Tag techniques at two medium-sized run-of-river hydropower plants. Survival rates (48 h) of juvenile fish were between 87 and 94% and for adult fish were between 75 and 90%. The mortality is comparable with results for Kaplan turbines from the literature and is lower than those of small hydropower plants. The lower mortality at the Mur power plant compared to the Drau power plant can plausibly be explained by a lower number of turbine blades (4 instead of 5), a lower hydraulic head and a slightly slower turbine runner speed. The proportion of injury varied species-specifically, with higher external injury rates in adult nase than in chub and and increased loss of equilibrium in juvenile grayling.