Effects of Varying Flows in Man-Made Streams on Rainbow Trout (Salmo Gairdneri Richardson) Fry

  • J. R. Irvine


The published proceedings of the two previous international symposia on regulated streams (Ward & Stanford 1979; Lillehammer & Saltveit 1984), as well as the papers presented at this third symposium, indicate the concern for understanding impacts of flow regulation on fish and other aquatic organisms. A major difficulty in the study of regulated streams is conducting studies with proper scientific controls. A survey of the papers published in the two previous symposia revealed only two studies which had the controls in space and time recommended by Green (1979). Although for many regulated rivers it is not possible to conduct impact studies with good controls, the limitations, and consequently the validity of predictions from these studies, must be realized. Impact assessments lacking control areas may record unrelated changes and attribute these to the impact. Assessments lacking a temporal control may not detect that differences existed between the control area and the impacted area before the impact occurred.


Rainbow Trout Control Period Flow Fluctuation Control Stream Density Stream 
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Copyright information

© Plenum Press, New York 1987

Authors and Affiliations

  • J. R. Irvine
    • 1
  1. 1.Department of ZoologyUniversity of OtagoDunedinNew Zealand

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