Modellierung der Schwimmfähigkeit europäischer Fischarten — Zielgrößen für die hydraulische Bemessung von Fischschutzsystemen

Ebel, Guntram

doi:10.1365/s35147-014-1095-1

Cited by 12 publications

(2 citation statements)

References 6 publications

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“…A trout (BL = 0.27 m) holding station experienced a relative flow velocity of about U fish = 3.0 BL/s in large parts of the jet in setup 1. At our water temperature, trout can maintain a sustained swimming speed of U fish = 4.5 BL/s for up to 200 min according to Ebel's model equation for the rheophilic guild [38]. Thus, in theory, trout…”

Section: Plos Onementioning

confidence: 92%

“…It reached the maximum value at a burst speed of k F = 25 BL/s [37]. We note that more realistic speed-fatigue relations are available [37,38], but they were not required for our purpose of modeling orientation. From the balance of time-averaged M and F, one of three horizontal behavioral rules was selected (Fig 2 ): • migrating (moving upstream),…”

Section: Behavioral Model Descriptionmentioning

confidence: 99%

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Development of behavioral rules for upstream orientation of fish in confined space

2022

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Improving the effectiveness of fishways requires a better understanding of fish behavior near hydraulic structures, especially of upstream orientation. One of the most promising approaches to this problem is the use of model behavioral rules. We developed a three-dimensional individual-based model based on observed brown trout (Salmo trutta fario) movement in a laboratory flume and tested it against two hydraulically different flume setups. We used the model to examine which of five behavioral rule versions would best explain upstream trout orientation. The versions differed in the stimulus for swim angle selection. The baseline stimulus was positive rheotaxis with a random component. It was supplemented by attraction towards either lower velocity magnitude, constant turbulence kinetic energy, increased flow acceleration, or shorter wall distance. We found that the baseline stimulus version already explained large parts of the observed behavior. Mixed results for velocity magnitude, turbulence kinetic energy, and flow acceleration indicated that the brown trout did not orient primarily by means of these flow features. The wall distance version produced significantly improved results, suggesting that wall distance was the dominant orientation stimulus for brown trout in our hydraulic conditions. The absolute root mean square error (RMSE) was small for the best parameter set (RMSE = 9 for setup 1, RMSE = 6 for setup 2). Our best explanation for these results is dominance of the visual sense favored by absence of challenging hydraulic stimuli. We conclude that under similar conditions (moderate flow and visible walls), wall distance could be a relevant stimulus in confined space, particularly for fishway studies and design in IBMs, laboratory, and the field.

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Section: Plos Onementioning

confidence: 92%

Section: Behavioral Model Descriptionmentioning

confidence: 99%

Development of behavioral rules for upstream orientation of fish in confined space

2022

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Passage through a fishway entrance at different velocities—results from flume experiments with small non‐salmonids

Schütz,

Czerny,

Herbst

et al. 2024

River Research & Apps

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A challenge in the design of fishways especially for large rivers is the trade‐off between attraction and passability of the entrance. High flow velocities in the entrance slot generate a strong attraction flow and tend to have better attraction efficiency for upstream migration. However, these velocities may also prevent small‐bodied species or juvenile fish from entering the fishway. With our experiment, we reproduced fish swimming behaviour and passage of a fishway entrance for small‐bodied fish under realistic hydraulic conditions. At an entrance slot with 0.4 m width four velocities 0.8, 1.2, 1.5 and 1.8 ms−1 were investigated. In total, 326 juvenile roach (Rutilus rutilus (Linnaeus, 1758)), gudgeons (Gobio gobio (Linnaeus, 1758)) and spirlins (Alburnoides bipunctatus (Bloch, 1782)) were tested. The passage rates of the three tested species were altogether higher than would have been predicted from reported swimming capacities. They increased from gudgeons to roach and (significantly) to spirlins and we could show how passage rates of the three species decreased with increasing flow velocities, suggesting species‐specific critical slot velocities. Still, these velocities are lower than those currently proposed to generate sufficient attraction flow, which may have implications for fishway design.

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An Experimental Approach for the Quantitative Assessment of Downstream Swimming Fish Behavior

Roth,

Wagner,

Roessger

et al. 2024

River Research & Apps

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Behavior of fish influences the mortality risk during turbine and pump passages. Knowledge about species‐specific behavior and its triggers is necessary for improving numerical models and the development of autonomous sensor probes to estimate fish mortality in turbines and pumps. A primary objective of the RETERO project is the study of fish behavior in hydraulic conditions similar to turbine and pump intakes in controlled conditions. For this purpose, an experimental conduit was constructed at the Hubert‐Engels Laboratory of the TUD Dresden University of Technology (Germany) equipped with a 3D camera infrared tracking system. The conduit was designed to model hydraulic conditions typical for turbine and pump intakes. In the experimental setup, the effects of flow velocities exceeding the maximum swim speed of fish, as well as spatial velocity gradients and illumination conditions on the fish behavior are studied. The data from brown trout (Salmo trutta) allow for an analysis of how these fish react to flow accelerations and velocities surpassing their sprint speed, using quantitative metrics for movement and activity. An initial evaluation of these experiments highlights the potential of this approach for further research.

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Modellierung der Schwimmfähigkeit europäischer Fischarten — Zielgrößen für die hydraulische Bemessung von Fischschutzsystemen

Cited by 12 publications

References 6 publications

Development of behavioral rules for upstream orientation of fish in confined space

Development of behavioral rules for upstream orientation of fish in confined space

Passage through a fishway entrance at different velocities—results from flume experiments with small non‐salmonids

An Experimental Approach for the Quantitative Assessment of Downstream Swimming Fish Behavior

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