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Sneaker, Dweller and Commuter: Evaluating Fish Behavior in Net-Based Monitoring at Hydropower Plants—A Case Study on Brown Trout ( Salmo trutta )

Author

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  • Nicole Smialek

    (Aquatic Systems Biology, TUM School of Life Sciences, Technical University of Munich, Mühlenweg 22, 85354 Freising, Germany)

  • Joachim Pander

    (Aquatic Systems Biology, TUM School of Life Sciences, Technical University of Munich, Mühlenweg 22, 85354 Freising, Germany)

  • Arne Heinrich

    (Aquatic Systems Biology, TUM School of Life Sciences, Technical University of Munich, Mühlenweg 22, 85354 Freising, Germany)

  • Juergen Geist

    (Aquatic Systems Biology, TUM School of Life Sciences, Technical University of Munich, Mühlenweg 22, 85354 Freising, Germany)

Abstract

Monitoring of fish passage at hydropower plants largely relies on stow-fyke-net captures installed downstream of turbine outlets, yet little is known about which fish behavior contributes to reduced catch efficiency. We studied fish-net interactions as well as biological and physical factors potentially influencing behavior in three experiments: (i) fall-through experiment, to measure the general physical ability of a fish to fit through a certain mesh size; (ii) net-perception experiment, where fish were filmed while being exposed to different mesh sizes, flow and lure conditions in a controlled arena setup; and (iii) stow-fyke-net experiment, where fish behavior was recorded using 20 cameras simultaneously inside a stow net during regular hydropower fish monitoring. In total, we analyzed 382 h of video recordings. The material revealed that fish interacted with the net on a high rate, independent of flow conditions, and tried to swim through the mesh regardless of whether their body fits through. Under field conditions, the fish showed three specific behavioral patterns, “sneaking,” “dwelling” and “commuting,” which led to a reduced recapture rate in the catch unit of the stow-fyke net. This study highlights the importance of considering fish behavior in future fish monitoring programs to improve the accuracy of turbine-effect assessments on fish.

Suggested Citation

  • Nicole Smialek & Joachim Pander & Arne Heinrich & Juergen Geist, 2021. "Sneaker, Dweller and Commuter: Evaluating Fish Behavior in Net-Based Monitoring at Hydropower Plants—A Case Study on Brown Trout ( Salmo trutta )," Sustainability, MDPI, vol. 13(2), pages 1-20, January.
  • Handle: RePEc:gam:jsusta:v:13:y:2021:i:2:p:669-:d:479036
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    References listed on IDEAS

    as
    1. Sachs, Michael C., 2017. "plotROC: A Tool for Plotting ROC Curves," Journal of Statistical Software, Foundation for Open Access Statistics, vol. 79(c02).
    2. Josef Knott & Melanie Mueller & Joachim Pander & Juergen Geist, 2019. "Fish Passage and Injury Risk at a Surface Bypass of a Small-Scale Hydropower Plant," Sustainability, MDPI, vol. 11(21), pages 1-14, October.
    3. Wickham, Hadley, 2011. "The Split-Apply-Combine Strategy for Data Analysis," Journal of Statistical Software, Foundation for Open Access Statistics, vol. 40(i01).
    Full references (including those not matched with items on IDEAS)

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