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<p>Using age-class-based population modeling, the possible effects of turbine-related mortality of different age stages due to barotrauma (larval and juvenile fish stages up to 0+) and blade strike injuries (fish from 1+) on populations of the typical European river fish species grayling, chub, barbel, perch and nase in medium-sized rivers were calculated as a&#xa0;function of the probability of turbine passage in different scenarios. Each age class was assigned a&#xa0;natural baseline mortality based on existing information and a&#xa0;turbine-induced mortality was added for the determined percentages of migrating stages according to the damage rates determined. To estimate the effects of damage caused by barotrauma and blade strike, these effects were modelled for previously defined stabilized populations without consideration of other natural factors for populations of grayling, aitel, barbel, perch and nase (so-called “zero-impact approach”). On the one hand, the theoretical annual damage potential of all age stages potentially migrating in different percentages due to turbines was calculated without taking natural mortality into account; on the other hand, the isolated impact of turbine-related mortality was modeled on population level over a&#xa0;period of 25&#xa0;years with the aim of evaluating the theoretical effects of protective and compensatory measures. The annual potential damage to adult fish populations, depending on the assumed probability of an annual turbine passage (17 and 39%, 1% and 10% for perch), ranged between 2.7–6.1% (grayling), 2.4–5.5% (chub), 2.4–5.6% (barbel), 0.04–0.41% (perch) and 3.1–7.0% (nase), when considering all age stages from 1+ it was 2.1–4.8% (grayling), 1.1–2.6% (chub), 1.2–2.8% (barbel), 0.02–0.22% (perch) and 1.4–3.3% (nase). The calculated annual decrease in biomass for the key fish species of nase, barbel and chub including all age stages from 1+ ranged between 2.2–6.7%. Mechanical barriers of different bar widths were not able to compensate for the mortality-related losses, which was only achieved by corresponding improvements in the survival of eggs, larvae and juveniles.</p>

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Modellierung potenzieller Auswirkungen turbinenbedingter Mortalität an mittelgroßen Fließgewässern auf Populationen typischer europäischer Flussfischarten

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  • 发表日期：

    2025年6月27日

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  • Andreas Zitek,
  • Clemens Ratschan,
  • Josef Schneider

摘要

Using age-class-based population modeling, the possible effects of turbine-related mortality of different age stages due to barotrauma (larval and juvenile fish stages up to 0+) and blade strike injuries (fish from 1+) on populations of the typical European river fish species grayling, chub, barbel, perch and nase in medium-sized rivers were calculated as a function of the probability of turbine passage in different scenarios. Each age class was assigned a natural baseline mortality based on existing information and a turbine-induced mortality was added for the determined percentages of migrating stages according to the damage rates determined. To estimate the effects of damage caused by barotrauma and blade strike, these effects were modelled for previously defined stabilized populations without consideration of other natural factors for populations of grayling, aitel, barbel, perch and nase (so-called “zero-impact approach”). On the one hand, the theoretical annual damage potential of all age stages potentially migrating in different percentages due to turbines was calculated without taking natural mortality into account; on the other hand, the isolated impact of turbine-related mortality was modeled on population level over a period of 25 years with the aim of evaluating the theoretical effects of protective and compensatory measures. The annual potential damage to adult fish populations, depending on the assumed probability of an annual turbine passage (17 and 39%, 1% and 10% for perch), ranged between 2.7–6.1% (grayling), 2.4–5.5% (chub), 2.4–5.6% (barbel), 0.04–0.41% (perch) and 3.1–7.0% (nase), when considering all age stages from 1+ it was 2.1–4.8% (grayling), 1.1–2.6% (chub), 1.2–2.8% (barbel), 0.02–0.22% (perch) and 1.4–3.3% (nase). The calculated annual decrease in biomass for the key fish species of nase, barbel and chub including all age stages from 1+ ranged between 2.2–6.7%. Mechanical barriers of different bar widths were not able to compensate for the mortality-related losses, which was only achieved by corresponding improvements in the survival of eggs, larvae and juveniles.