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Open-File Report 2007-1140

Open-File Report 2007-1140

Fish Movement Ecology in High Gradient Headwater Streams: Its Relevance to Fish Passage Restoration Through Stream Culvert Barriers

By Robert Hoffman, Jason Dunham


Restoration of fish passage through culvert barriers has emerged as a major issue in the Pacific Northwest and nationwide, in part, because of their potential influence on fish movement. Movement is an essential mechanism by which mobile animals acquire the resources necessary for the successful completion of their life-cycles. In this report, we provide a brief review of some essential characteristics of animal movement and examples from a focal group of fishes in Washington State: salmon, trout, and char. We begin by outlining some basic characteristics of animal movement and then apply that foundation to the case of salmonid fishes. Next we consider the consequences of disrupting fish movement with human-constructed barriers, such as culverts. Finally, this body of evidence is summarized, and we propose a short list of what we view as high priority information needs to support more effective restoration of fish passage through culverts.


Executive Summary
General Characteristics of Fish Movement
Characteristics of Salmonid Movement in Headwater Streams
Distribution of Salmonids in Headwater Streams
Impacts of Human-Placed Barriers on Fish Populations
Culverts and Fish Passage
Information needs for fish passage restoration through culverts
References Cited
Appendix I
Appendix II

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Send questions or comments about this report to the authors, Robert Hoffman, (541)750-1013 Jason Dunham, (541)750-7397.

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