Post-release stranding rates of stocked allis shad (Alosa alosa) larvae exposed to surface wave action

Stoll, Stefan; Beeck, Peter

doi:10.1111/j.1439-0426.2011.01879.x

Cited by 5 publications

(3 citation statements)

References 13 publications

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“…The experiments confirmed this assumption, as we documented a clear difference in stranding between larval stages III-IV and V. In detail, the smaller larval stage (range of mean length: 12.9-14.3 mm) showed about four times higher stranding rates than the larger one (range of mean length: 14.8-16.5 mm). This is also evident as stranding rates decrease with increasing fish length, which is consistent with other studies (Stoll and Beeck, 2011;Harby et al, 2015). We suggest conducting further experiments on earlier stages (e.g., I-II).…”

Section: Discussionsupporting

confidence: 92%

Stranding of larval nase (Chondrostoma nasus L.) depending on bank slope, down-ramping rate and daytime

Führer

Hayes²,

Hasler³

et al. 2022

Front. Environ. Sci.

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Rapid water level decreases due to hydropeaking are known to negatively affect riverine biota, mainly due to the stranding of organisms in the river bank area that becomes regularly dewatered. Even though studies of the last decades have focused on salmonid fish, also cyprinids may be affected. However, limited knowledge is available of this fish family. Therefore, we conducted mesocosm experiments under semi-natural conditions, simulating single hydropeaking events at two different lateral bank slopes (2% and 5%) with varying down-ramping rates (0.7–3.0 cm min−1) during day and night. As a response parameter, we quantified stranding rates of different larval stages (III-IV and V) of common nase (Chondrostoma nasus L.). The experiments revealed that lower sloped banks exhibited distinctly higher stranding rates than steeper ones. Daytime revealed a similar pattern, with more fish becoming stranded at night than during the day, and this was consistent for all down-ramping rates. The data also indicate increased stranding with higher down-ramping rates, particularly at low sloped riverbanks, and interaction effects between the tested parameters. Overall, this study, for the first time, quantifies the consequences of flow down-ramping on nase larvae, also revealing differences between larval stages. The gained information will, therefore, advance the ongoing discussion on hydropeaking mitigation by providing a deeper understanding of the effects of artificial sub-daily flow fluctuations on the early life stages of cyprinid fish. Our results can inform management and policy to sharpen existing mitigation concepts and fine-tune hydropower operations to reduce negative effects on riverine ecosystems.

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Section: Discussionsupporting

confidence: 92%

Stranding of larval nase (Chondrostoma nasus L.) depending on bank slope, down-ramping rate and daytime

Führer

Hayes²,

Hasler³

et al. 2022

Front. Environ. Sci.

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“…Hydropower plants are still massive obstacles for salmon migration as they are without sufficient fish pass installations, while still causing substantial losses of smolts during downstream migration (turbine mortality). Fish passages and protection from entrainment at hydropower plants are, therefore, major challenges to overcome to achieve successful reintroduction of salmon and other migratory fish species in the River Rhine (Stoll and Beeck, 2011; Schneider, 2011).…”

Section: The River Rhine and Its Tributariesmentioning

confidence: 99%

Atlantic Salmon (Salmo salar L.) re-introduction in Germany: a status report on national programmes and activities

Monnerjahn

2011

Journal of Applied Ichthyology

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Summary Atlantic Salmon (Salmo salar) once was a common fish in German rivers. In the course of the industrial revolution the water quality decreased, the rivers were straightened and gradually fragmented by weirs and dams. As a consequence the salmon populations drastically decreased and finally became extinct by the middle of the last century. About 20 years later, in 1978, the first salmon was released in an attempt to re‐establish this valuable species. Today re‐introduction programmes are running at all former important salmon rivers, namely at the rivers Rhine, Ems, Weser, Elbe as well as some smaller rivers. This contribution provides a short overview on the status of these re‐introductions, the success stories as well as the drawbacks of salmon re‐introduction in German rivers.

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“…The allis shad is an anadromous fish within the family Clupeidae, which was formerly widespread throughout Western Europe. Overfishing, bad water quality and migration barriers have led to a collapse of allis shad stocks in most Atlantic tributaries by the mid-20th century, including the River Rhine (Stoll and Beeck 2011). Larger spawning populations currently remain only in a few Atlantic tributaries in the south-west of France, the largest population being in the Gironde-Garonne-Dordogne system.…”

Section: Introductionmentioning

confidence: 99%

A new approach combining forensic thresholds and a multiple-tubes approach to unravel false microsatellite profiles from cross-contaminated sample material

Mäck

Scharbert²,

Schulz

et al. 2020

Conservation Genet Resour

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Contamination and degradation are known challenges for reliable genotyping, since they can cause, among other problems, false microsatellite profiles. In this study we described a method to decrease the proportion of false microsatellite profiles from fish scale samples of endangered allis shads (Alosa alosa) from a reintroduction program, where cross-contamination with DNA from other individuals and potentially degradation of samples occurred. To maximize the portion of reliably measurable results, we modified and combined two known approaches—thresholds used in forensic DNA analyses and a multiple-tubes approach. This combined approach increased reliable microsatellite profiles compared with single approaches. The forensic thresholds and the multiple-tubes approach increased the measurable results from 55 to 67% and 75%, respectively, whereas the combined approach accomplished an increase to 90%. This illustrates the potential of the combined approach for other studies with comparable problems or sample material.

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Post-release stranding rates of stocked allis shad (Alosa alosa) larvae exposed to surface wave action

Cited by 5 publications

References 13 publications

Stranding of larval nase (Chondrostoma nasus L.) depending on bank slope, down-ramping rate and daytime

Stranding of larval nase (Chondrostoma nasus L.) depending on bank slope, down-ramping rate and daytime

Atlantic Salmon (Salmo salar L.) re-introduction in Germany: a status report on national programmes and activities

A new approach combining forensic thresholds and a multiple-tubes approach to unravel false microsatellite profiles from cross-contaminated sample material

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