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Wiley InterScience | |||||||
  Fisheries Management and EcologyVolume 14 Issue 1, Pages 61 - 71 Published Online: 5 Jan 2007 © 2010 Blackwell Publishing Ltd
Abstract | References | Full Text: HTML, PDF (Size: 639K) | Related Articles | Citation Tracking  Optimising Denil fishways for passage of small and large fishes *Present address: Arthur Rylah Institute for Environmental Research, Post Office Box 137, Heidelberg, Victoria 3084, Australia (e-mail: ivor.stuart@dse.vic.gov.au) Copyright 2007 The Authors. Journal compilation 2007 Blackwell Publishing Ltd KEYWORDS Australia • bony herring • Denil • fish passage • fishways • potamodromous migration ABSTRACTAbstract An 8-m long experimental fishway was trialled at three different slopes [8.3% (1:12), 14.3% (1:7) and 20% (1:5)] to examine the potential of the single-plane Denil fishway for the passage of small- and large-bodied native fishes in Australia. Fish between 45 and 630 mm ascended the fishway. The lowest slope enabled the full size range of bony herring Nematalosa erebi (Günther), from 45 to 350 mm fork length, to ascend the fishway successfully as well as a higher numerical proportion; 88% at the 8.3% slope compared with 31% at the 20% slope (fish numbers per trial = 33–3936). These results dispel the notion that Denil fishways are inherently poor for small fishes. Manipulating the design parameters of slope, length, width and possibly depth-over-breadth ratio enables Denil fishways to pass a wide size range of fish, which may greatly extend their present application and enable them to make a greater contribution to the rehabilitation of diverse fish communities. | 
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