Cost-efficiency aspects for fish passage restoration in the Ruhr River Basin

Weyand, Michael; Redeker, Marq; Nusch, Ernst A.

doi:10.2166/wst.2006.324

Cited by 3 publications

(1 citation statement)

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“…Even small barriers can have drastic alterations on the behavior of populations by potentially causing phenotypical life‐strategy changes, such as fish becoming more resident (Branco et al, 2017). Engineered fish passage solutions are constructed to return these delicate riverine ecosystems back to a healthy state (Bunt et al, 2012; Clay, 1995; Lucas & Baras, 2001), often in response to local legislation (e.g., European Union Water Framework Directive [WFD] [EC, 2000; 2000/60/EEC]) and at huge expense (Weyand et al, 2006). Studies quantifying fish pass performance are scarce in comparison to the number of fish passes constructed (Cooke & Hinch, 2013).…”

Section: Introductionmentioning

confidence: 99%

Can't pass or won't pass: the importance of motivation when quantifying improved connectivity for riverine brown trout Salmo trutta

Dodd,

Cowx,

Joyce

et al. 2023

Journal of Fish Biology

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Reversing the negative impacts that anthropogenic habitat fragmentation has on animal movement is a key goal in the management of landscapes and conservation of species globally. Accurate assessment of measures to remediate habitat fragmentation, such as fish passage solutions in rivers, are imperative but are particularly challenging for territorial species, which are less likely to leave their existing home range, or populations composed of both migratory and resident individuals (i.e., partial migration). This investigation quantified the movements of translocated (captured upstream of the impediment and released downstream) and non‐translocated (captured and released downstream of the impediment) riverine brown trout (Salmo trutta L.), a species known to perform a homing movement, through a fish pass using passive integrated transponder (PIT) telemetry. A significantly higher proportion of translocated fish approached, entered, and passed (on a wider range of flows) compared to non‐translocated fish, consistent with the theory that motivation is a key driver in fish pass use. Translocated fish that entered the pass were significantly larger than those that approached but did not enter, presumably due to physiological capability. Translocated fish were a more reliable indicator of the fish passage solution effectiveness than non‐translocated fish. Our findings hence imply that many fish passage solutions globally, and potentially measures to remediate habitat fragmentation for other taxa, may have been mistakenly assessed for unmotivated animals. Studying both non‐translocated and translocated fish is recommended to provide more accurate and cost‐effective fish passage solution assessments.

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Section: Introductionmentioning

confidence: 99%

Can't pass or won't pass: the importance of motivation when quantifying improved connectivity for riverine brown trout Salmo trutta

Dodd,

Cowx,

Joyce

et al. 2023

Journal of Fish Biology

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show abstract

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2006

Hydrological Processes

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River continuity under difficult boundary conditions–useful steps and practical hints for designing a fish way

Weyand

Kühlmann

2016

Water Practice and Technology

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Most large and medium sized river basins in Germany have, over time, been affected by anthropogenic changes due to navigation, hydropower generation, and straightening and shortening of river courses for land reclamation. Consequently, there are many weirs inhibiting fish migration. The Ruhr River is affected by several such barriers or obstacles of which Baldeney Weir is the biggest. The search for an appropriate fish pass structure has not been easy given that the location is embedded in urban surroundings and used for traffic or recreation. This situation led to the establishment of an expert working group chaired by the Ruhrverband to discuss the problems and find a common solution. In a step by step approach, all necessary basic information was elaborated and evaluated, including consideration of diverse fish pass types. Setting up a working group of experts and responsible decision makers was found to be an appropriate method of overcoming differing opinions, sometimes based only on subjective, one-sided assessments, and reaching a mutually acceptable solution.

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Cost-efficiency aspects for fish passage restoration in the Ruhr River Basin

Cited by 3 publications

References 0 publications

Can't pass or won't pass: the importance of motivation when quantifying improved connectivity for riverine brown trout Salmo trutta

Can't pass or won't pass: the importance of motivation when quantifying improved connectivity for riverine brown trout Salmo trutta

Current awareness

River continuity under difficult boundary conditions–useful steps and practical hints for designing a fish way

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