Juvenile salmonid collection efforts in the Upper Cowlitz River Basin

Liedtke, Theresa L.; Kock, Tobias J.; Ekstrom, Brian K.; Royer, Ida M.; Rondorf, D.W.

doi:10.3133/70179290

Cited by 1 publication

(2 citation statements)

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“…Head-of-reservoir collection ( Fig. 1) is currently being considered at several sites where in-reservoir conditions are thought to limit the number of juvenile outmigrants that survive, move downstream, and enter a dam forebay for potential collection (Liedtke et al 2010;Clancey et al 2017;Kock et al 2019b). Headof-reservoir systems may be effective in reservoirs that are very large, have complex bathymetry or hydrology, or lack velocity cues needed for juvenile salmonids to successfully orient and move downstream (e.g., Shasta Reservoir on the Sacramento River, California; Clancey et al 2017).…”

Section: Fish Traps and Collection Facilitiesmentioning

confidence: 99%

“…Such systems may also be appropriate in reservoirs with large populations of piscivorous fishes that can substantially reduce survival of downstream migrants, as in Lookout Point Reservoir on the Middle Fork Willamette River (Kock et al 2019b) and in Fall Creek Reservoir (Murphy et al 2019). Development and testing of head-of-reservoir collection systems is an emerging research topic in trap-and-haul science (Liedtke et al 2010;Clancey et al 2017). The survival benefits for juveniles transported past reservoirs and dams are potentially substantial, but there are not currently any operational head-of-reservoir collection systems and no data are available to assess the efficacy of this approach.…”

Section: Fish Traps and Collection Facilitiesmentioning

confidence: 99%

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

Kock

Ferguson

Keefer

et al. 2020

Rev Fish Biol Fisheries

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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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