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Open AccessArticle

Evaluation of Low-Head Ramped Weirs for a Potamodromous Cyprinid: Effects of Substrate Addition and Discharge on Fish Passage Performance, Stress and Fatigue

1
Forest Research Centre, School of Agriculture, University of Lisbon, Tapada da Ajuda, 1349-017 Lisboa, Portugal
2
CERIS—Civil Engineering for Research and Innovation for Sustainability, Técnico, University of Lisbon, Avenida Rovisco Pais, 1049-001 Lisboa, Portugal
*
Authors to whom correspondence should be addressed.
Academic Editor: Bommanna Krishnappan
Water 2021, 13(6), 765; https://doi.org/10.3390/w13060765
Received: 5 February 2021 / Revised: 7 March 2021 / Accepted: 9 March 2021 / Published: 11 March 2021
Requalification of low-head ramped weirs through the addition of substrates (retrofitting) has attracted attention in recent years. However, few studies are available on how this measure affects the negotiation of ramped weirs by fish. This study aimed to assess the performance of an experimental ramped weir (3.00 m long with 10% slope; 0.30 m head-drop) to enhance the passage of a potamodromous cyprinid species, the Iberian barbel (Luciobarbus bocagei). Attention was given to testing the effects of the addition of a substrate, in this case cobbles, to the ramp (Nature) vs. a smooth bottom (Control), and discharge (Q; 55 L·s−1 and 110 L·s−1 (or specific discharge per unit width, q = 92 L·s−1·m−1 and 183 L·s−1·m−1)) on fish passage performance. Fish physiological responses to stress and fatigue, measured by glucose and lactate concentrations in blood samples, were also analysed. Results showed that the Nature design generally increased fish movements and successful upstream passages, and enhanced fish passage performance by enabling faster negotiations. Fish movements were also affected by increasing discharge, registering reductions with 110 L·s−1. Results of the physiological parameters indicate that both glucose and lactate concentrations were also influenced by discharge. The outcomes from this study present important information about fish passage performance across low-head ramped weirs and could provide data needed to help biologists and engineers to develop more effective structures to alleviate small instream obstacles. View Full-Text
Keywords: low-head ramped weirs; substrate addition; potamodromous cyprinid species; upstream migration; physiological parameters; ecohydraulics low-head ramped weirs; substrate addition; potamodromous cyprinid species; upstream migration; physiological parameters; ecohydraulics
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MDPI and ACS Style

Amaral, S.D.; Branco, P.; Romão, F.; Ferreira, M.T.; Pinheiro, A.N.; Santos, J.M. Evaluation of Low-Head Ramped Weirs for a Potamodromous Cyprinid: Effects of Substrate Addition and Discharge on Fish Passage Performance, Stress and Fatigue. Water 2021, 13, 765. https://doi.org/10.3390/w13060765

AMA Style

Amaral SD, Branco P, Romão F, Ferreira MT, Pinheiro AN, Santos JM. Evaluation of Low-Head Ramped Weirs for a Potamodromous Cyprinid: Effects of Substrate Addition and Discharge on Fish Passage Performance, Stress and Fatigue. Water. 2021; 13(6):765. https://doi.org/10.3390/w13060765

Chicago/Turabian Style

Amaral, Susana D.; Branco, Paulo; Romão, Filipe; Ferreira, Maria T.; Pinheiro, António N.; Santos, José M. 2021. "Evaluation of Low-Head Ramped Weirs for a Potamodromous Cyprinid: Effects of Substrate Addition and Discharge on Fish Passage Performance, Stress and Fatigue" Water 13, no. 6: 765. https://doi.org/10.3390/w13060765

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