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Mini hydro development workshop: developing sustainable solutions for native fish

Mini hydro development workshop: developing sustainable solutions for native fish Introduction Almost all freshwater fish are migratory and undertake small‐ and large‐scale movements to access spawning, feeding and nursery habitat ( Lucas & Baras 2001 ). Increased irrigation development, consumptive water use and construction of regulatory structures have led to a worldwide increase in the number of low‐level water regulation devices that prevent migratory fish movement ( V˝r˝smarty 2000 ). These mainly provide water security, irrigation or power generation, but almost all have had a negative impact on upstream and downstream fish communities. Environmental impacts were relatively unknown when many of these devices were first constructed. It is now widely understood that river regulation has led to severe declines in many freshwater capture fisheries ( Bayley 1995 ). Large‐scale hydro‐electric systems are frequently associated with fish declines, particularly among salmonid species ( Williams 2008 ). Fish that pass through hydro‐electric systems experience injury and mortality attributed to either physical strike, rapid pressure change or shear stress ( Cada 1998 ). Applied research has determined the main mechanisms contributing to fish mortality, and results are being adaptively used to develop mitigation programmes ( Deng 2005 ; Brown 2009 ). Most work is based on salmonid species, and current mitigation http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Ecological Management & Restoration Wiley

Mini hydro development workshop: developing sustainable solutions for native fish

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References (10)

Publisher
Wiley
Copyright
© 2012 Ecological Society of Australia
ISSN
1442-7001
eISSN
1442-8903
DOI
10.1111/j.1442-8903.2012.00671.x
Publisher site
See Article on Publisher Site

Abstract

Introduction Almost all freshwater fish are migratory and undertake small‐ and large‐scale movements to access spawning, feeding and nursery habitat ( Lucas & Baras 2001 ). Increased irrigation development, consumptive water use and construction of regulatory structures have led to a worldwide increase in the number of low‐level water regulation devices that prevent migratory fish movement ( V˝r˝smarty 2000 ). These mainly provide water security, irrigation or power generation, but almost all have had a negative impact on upstream and downstream fish communities. Environmental impacts were relatively unknown when many of these devices were first constructed. It is now widely understood that river regulation has led to severe declines in many freshwater capture fisheries ( Bayley 1995 ). Large‐scale hydro‐electric systems are frequently associated with fish declines, particularly among salmonid species ( Williams 2008 ). Fish that pass through hydro‐electric systems experience injury and mortality attributed to either physical strike, rapid pressure change or shear stress ( Cada 1998 ). Applied research has determined the main mechanisms contributing to fish mortality, and results are being adaptively used to develop mitigation programmes ( Deng 2005 ; Brown 2009 ). Most work is based on salmonid species, and current mitigation

Journal

Ecological Management & Restoration – Wiley

Published: Sep 1, 2012

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