Abstract
In many regulated rivers, silver eels (Anguilla anguilla L.) experience significant mortality as they pass through small hydropower stations (HPS) during their downstream migration. There has been a huge collapse in the recruitment of this species, primarily because of the destruction of river–ocean connectivity with overfishing. The direct mortality caused by small hydro turbines varies between different places and depends on many factors. The aim of the present study was to assess the mortality rate of silvers eels passing through a small HPS equipped with a Francis turbine in a small Pomeranian river using acoustic telemetry. During the experiment, no direct mortality occurred as a result of passage through the HPS turbine. However, three individuals were believed to have suffered from injuries or passage trauma.
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