Review of trap-and-haul for managing Pacific salmonids (Oncorhynchus spp.) in impounded river systems

Reviews in Fish Biology and Fisheries
By: , and 



High-head dams are migration barriers for Pacific salmon Oncorhynchus spp. in many river systems and recovery measures for impacted stocks are limited. Trap-and-haul has been widely used in attempts to facilitate recovery but information from existing programs has not been synthesized to inform improvements to aid recovery of salmonids in systems with high-head dams. We reviewed 17 trap-and-haul programs regarding Pacific salmon to: (1) summarize information about facility design, operation and biological effects; (2) identify critical knowledge gaps; and (3) evaluate trap-and-haul as a current and future management tool. Existing programs are operated to address a range of management goals including restoring access to historical habitats, temporarily reducing exposure to dangerous in-river conditions, and reintroducing ecological processes upstream from dams. Information gathered from decades of operation on facility design criteria and fish handling protocols, and robust literature on fish collection and passage are available. While many aspects of trap-and-haul have been evaluated, effects on population productivity and sustainability remain poorly understood. Long-term and systematic studies of trap-and-haul outcomes are rare, and assessments can be confounded by concurrent management actions and broad ecological and climatic effects. Existing data suggest that performance and effectiveness vary among programs and over various time scales within programs. Although critical information gaps exist, trap-and-haul is an important management and conservation tool for providing Pacific salmonids access to historical habitats. Successful application of trap-and-haul programs requires long-term commitment and an adaptive management approach by dam owners and stakeholders, and careful planning of new programs.

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Publication type Article
Publication Subtype Journal Article
Title Review of trap-and-haul for managing Pacific salmonids (Oncorhynchus spp.) in impounded river systems
Series title Reviews in Fish Biology and Fisheries
DOI 10.1007/s11160-020-09627-7
Volume 31
Year Published 2021
Language English
Publisher Springer
Contributing office(s) Western Fisheries Research Center
Description 42 p.
First page 53
Last page 94
Country United States
State California, Idaho, Oregon, Washington
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