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Marcell Szabo-Meszaros
Department of Civil and Environmental Engineering, Norwegian University of Science and Technology, S. P. Andersens 5, 7491 Trondheim, Norway

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Journal article
Published: 28 April 2021 in Water
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Fish swimming performance is strongly influenced by flow hydrodynamics, but little is known about the relation between fine-scale fish movements and hydrodynamics based on in-situ investigations. In the presented study, we validated the etho-hydraulic fish swimming direction model presented in the River Mandal from Southern Norway, using similar behavioral and hydraulic data on salmon smolts from the River Orkla in Central Norway. The re-parametrized model explained the variation of the swimming direction of fish in the Orkla system in same degree as the original model performed in the Mandal system (R2: 84% in both cases). The transferability of the model when using it from one river to predict swimming direction in the other river was lower (R2: 21% and 26%), but nevertheless relatively high given that the two localities differed in hydraulic conditions. The analyses thus provide support for the fact that the identified hydraulic parameters and their interaction affected smolt behavior in a similar way at the two sites, but that local parametrization of the base model is required. The developed etho-hydraulic models can provide important insights into fish behavior and fish migration trajectories and can be developed into prediction models important for the future development of behavioral downstream migration solutions.

ACS Style

Marcell Szabo-Meszaros; Ana Silva; Kim Bærum; Henrik Baktoft; Knut Alfredsen; Richard Hedger; Finn Økland; Karl Gjelland; Hans-Petter Fjeldstad; Olle Calles; Torbjørn Forseth. Validation of a Swimming Direction Model for the Downstream Migration of Atlantic Salmon Smolts. Water 2021, 13, 1230 .

AMA Style

Marcell Szabo-Meszaros, Ana Silva, Kim Bærum, Henrik Baktoft, Knut Alfredsen, Richard Hedger, Finn Økland, Karl Gjelland, Hans-Petter Fjeldstad, Olle Calles, Torbjørn Forseth. Validation of a Swimming Direction Model for the Downstream Migration of Atlantic Salmon Smolts. Water. 2021; 13 (9):1230.

Chicago/Turabian Style

Marcell Szabo-Meszaros; Ana Silva; Kim Bærum; Henrik Baktoft; Knut Alfredsen; Richard Hedger; Finn Økland; Karl Gjelland; Hans-Petter Fjeldstad; Olle Calles; Torbjørn Forseth. 2021. "Validation of a Swimming Direction Model for the Downstream Migration of Atlantic Salmon Smolts." Water 13, no. 9: 1230.

Journal article
Published: 07 September 2020 in Sustainability
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Repeat spawners constitute an important component of Atlantic salmon populations, but survival of post-spawning individuals (kelts) are often compromised by anthropogenic structures such as hydropower plants (HPPs). Potential effects of HPPs include migration delays and associated increased energy depletion, which potentially results in increased overall mortality. We combined a detailed 3D hydraulic model with high-resolution 3D tracking of tagged kelts (length 73–104 cm) to obtain estimates of kelt movement through water. These estimates were then used in an energetics model to estimate hourly energy expenditure while negotiating the HPP area. Hourly kelt energy expenditure varied between 0.8 and 10.1 kJ × h−1 and was dependent on kelt length. Degree of additional energy depletion can amount to several percent of remaining energy content (our study indicates 4–5 percentage points) potentially leading to reduced post-spawning survival. In turn, this can nullify the iteroparous breeding strategy and jeopardize long-term stability and persistence of Atlantic salmon populations inhabiting HPP rivers.

ACS Style

Henrik Baktoft; Karl Gjelland; Marcell Szabo-Meszaros; Ana Silva; Milan Riha; Finn Økland; Knut Alfredsen; Torbjørn Forseth. Can Energy Depletion of Wild Atlantic Salmon Kelts Negotiating Hydropower Facilities Lead to Reduced Survival? Sustainability 2020, 12, 7341 .

AMA Style

Henrik Baktoft, Karl Gjelland, Marcell Szabo-Meszaros, Ana Silva, Milan Riha, Finn Økland, Knut Alfredsen, Torbjørn Forseth. Can Energy Depletion of Wild Atlantic Salmon Kelts Negotiating Hydropower Facilities Lead to Reduced Survival? Sustainability. 2020; 12 (18):7341.

Chicago/Turabian Style

Henrik Baktoft; Karl Gjelland; Marcell Szabo-Meszaros; Ana Silva; Milan Riha; Finn Økland; Knut Alfredsen; Torbjørn Forseth. 2020. "Can Energy Depletion of Wild Atlantic Salmon Kelts Negotiating Hydropower Facilities Lead to Reduced Survival?" Sustainability 12, no. 18: 7341.

Research article
Published: 24 June 2019 in Ecohydrology
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There is no generic solution to establish safe passage of downstream migrating fish passed hydropower facilities and mitigation measures are species‐ and site‐specific. Development of solutions is thus often based on “trial and error” and modelling based approaches may significantly reduce cost and time to arrive at successful mitigation. Here we explore such an approach by combining data on fish migration and hydraulic modelling. First, we performed a positional telemetry study at a dammed section of a Norwegian river, where 100 Atlantic salmon smolts were tagged to track their downstream movement at the vicinity of a hydropower intake channel and bypass gates. An explanatory model was developed to explore mechanisms of migration route, into the intake towards the turbines or through the bypass gates. Next, flow conditions during the smolt run was numerically modelled to explore the physical environment of the tracked smolts. The joint results from the two approaches supported the general assumption that downstream migration is strongly influenced by flow patterns and showed that fish entering the study site closer to the riverbank where the intake channel is located were more likely to enter the intake due to the strong currents towards the intake. Finally, a suite of measures to guide salmon smolts past the hydropower intake were proposed based on the findings and local conditions and tested by hydraulic modelling. We found that most of the measures, which were likely candidates for field trials would most likely fail at improving safe passage, and only a rack type guiding boom was promising. The presented combination of telemetry migration data and hydraulic modelling illustrates the value of evaluation of mitigation measures prior to implementation.

ACS Style

Marcell Szabo‐Meszaros; Torbjørn Forseth; Henrik Baktoft; Hans‐Petter Fjeldstad; Ana T. Silva; Karl Øystein Gjelland; Finn Økland; Ingebrigt Uglem; Knut Alfredsen. Modelling mitigation measures for smolt migration at dammed river sections. Ecohydrology 2019, 12, 1 .

AMA Style

Marcell Szabo‐Meszaros, Torbjørn Forseth, Henrik Baktoft, Hans‐Petter Fjeldstad, Ana T. Silva, Karl Øystein Gjelland, Finn Økland, Ingebrigt Uglem, Knut Alfredsen. Modelling mitigation measures for smolt migration at dammed river sections. Ecohydrology. 2019; 12 (7):1.

Chicago/Turabian Style

Marcell Szabo‐Meszaros; Torbjørn Forseth; Henrik Baktoft; Hans‐Petter Fjeldstad; Ana T. Silva; Karl Øystein Gjelland; Finn Økland; Ingebrigt Uglem; Knut Alfredsen. 2019. "Modelling mitigation measures for smolt migration at dammed river sections." Ecohydrology 12, no. 7: 1.