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Determining Barotrauma in the Pictus Catfish, Pimelodus Pictus

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Determining Barotrauma in the Pictus Catfish, Pimelodus Pictus University of Massachusetts Amherst ScholarWorks@UMass Amherst International Conference on Engineering and International Conference on River Connectivity Ecohydrology for Fish Passage (Fish Passage 2018) Dec 12th, 1:30 PM - 3:10 PM Determining barotrauma in the Pictus catfish, Pimelodus pictus, experimentally exposed to simulated hydropower turbine passage Bernardo Beirão Charles Sturt University Luiz Silva Charles Sturt University Richard Brown Charles Sturt University Ricardo Walker Charles Sturt University Follow this and additional works at: https://scholarworks.umass.edu/fishpassage_conference Beirão, Bernardo; Silva, Luiz; Brown, Richard; and Walker, Ricardo, "Determining barotrauma in the Pictus catfish, Pimelodus pictus, experimentally exposed to simulated hydropower turbine passage" (2018). International Conference on Engineering and Ecohydrology for Fish Passage. 20. https://scholarworks.umass.edu/fishpassage_conference/2018/December12/20 This Event is brought to you for free and open access by the Fish Passage Community at UMass Amherst at ScholarWorks@UMass Amherst. It has been accepted for inclusion in International Conference on Engineering and Ecohydrology for Fish Passage by an authorized administrator of ScholarWorks@UMass Amherst. For more information, please contact [email protected]. Determining barotrauma in the Pictus catfish, Pimelodus pictus, experimentally exposed to simulated hydropower turbine passage. Bernardo Beirão, Luiz Silva, Richard Brown and Ricardo Walker Institute for Land, Water and Society INTRODUCTION Institute for Land, Water and Society Electricity consumption World’s consumption - demand China – Non OECD Asian-countries (India, Thailand, etc) Institute for Land, Water and Society Renewable energy Further development should be focused on renewable sources Clean Development Mechanism CDM – 2005 Sustainable Development Mechanism SDM - 2016 Institute for Land, Water and Society Hydropower boom 17% Zarfl et al. (2014) 83% Institute for Land, Water and Society Impacts on fish Science – Insight/Perspectives – Vol 351; Issue 6269 Winemiller et al. (2016) Institute for Land, Water and Society Interaction with dam components • Turbines • Spillways Scenario A Tailrace • Scenario A – turbine passage • Scenario B – turbine stop/start- Draft tubes up operation. Scenario B Institute for Land, Water and Society Rapid decompression BOYLE’s LAW Brown et al. (2014) , 2010 et al. 푃 푉 = 푃 푉 1 1 2 2 PA STEPHENSON RPC Expansion of gases Rate inside the body (swim bladder) Institute for Land, Water and Society Study aims • Massive mortality events • High frequency of catfish – genus Pimelodus • Scarcity of hard data Understand the effects of rapid decompression in the Pictus catfish (Pimelodus pictus). Institute for Land, Water and Society MATERIAL AND METHODS Institute for Land, Water and Society Species and fish husbandry Pimelodus pictus Institute for Land, Water and Society Hypo-hyperbaric chamber Four stages: , 2010 • Acclimation et al. • Spike preparation • Determination of pressure of neutral buoyancy STEPHENSON • Decompression Institute for Land, Water and Society Hypo-hyperbaric chamber PNB Institute for Land, Water and Society Data analyses • Ni = N fish with a certain injury • 퐹푂 = (푁 Τ푁 ) ∗ 100 푖 푖 푡푖 • Nti = N fish with at least one injury Rare (<25%); Common (>25<75%); Frequent (>75%) 푃푁퐵 • 푅푃퐶 = Τ푃푁 Decompression timespan - TD Institute for Land, Water and Society Data analyses • RPC x Injury • Non-linear logistic regression • Grouped into TD Fastest T1 (TD<0.1s); Middle range T2 (0.1<TD<0.2s); Slowest T3(0.2<TD<0.3s) • Simple linear regression • Correlate swim bladder rupture with other injuries Institute for Land, Water and Society RESULTS Institute for Land, Water and Society Injuries • Swim bladder rupture • Emboli • Haemorrhage • Exophtalmia Institute for Land, Water and Society Non-linear models Intestine rupture Emboli Institute for Land, Water and Society Non-linear models Swim bladder rupture Internal haemorrhage Institute for Land, Water and Society Simple linear regression a) Emboli b) Intestine rupture c) Internal haemorrhage Institute for Land, Water and Society CONCLUSIONS Institute for Land, Water and Society Conclusions • Negative buoyancy • Benthic or benthopelagic species • Swim bladder rupture at low RPC (1.2 compared to 2.0 for Chinook salmon (Stephenson et al. 2010)) Although anaesthesia may relax the pneumatic duct Three-chambered swim bladder May not be influenced by acclimation pressure alone • Rate of pressure change seems to be important – needs more investigation Institute for Land, Water and Society Conclusions • Negative buoyancy may explain higher susceptibility to turbine entrainment of Pimelodus • Clear need to diversify species tested – different responses of P. pictus • Need to diversify methods to study benthic/benthopelagic species Institute for Land, Water and Society Acknowledgments THANK YOU! Institute for Land, Water and Society Charles Sturt University P.O. Box 789 ALBURY NSW 2640 Contact: AUSTRALIA Luiz Silva [email protected] www.csu.edu.au/research/ilws Tel: +61 2 6051 9730 http://www.facebook.com/ILWS.CSU Institute for Land, Water and Society.
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