Passage of adult coho salmon (Oncorhynchus kisutch) over Lake Creek Falls, Oregon, 2019

Fischer, Reed B.; Dunham, Jason B.; Scheidt, Nicholas; Hansen, Amy C.; Heaston, Emily D.

doi:10.3133/ofr20221083

Open-File Report

2022

DOI: 10.3133/ofr20221083

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Passage of adult coho salmon (Oncorhynchus kisutch) over Lake Creek Falls, Oregon, 2019

Reed B. Fischer¹,

Jason B. Dunham²,

Nicholas Scheidt³

et al.

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2024

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Assisted migration of coho salmon: Influences of passage and habitat availability on population dynamics

Benjamin,

Dunham,

Scheidt

et al. 2024

River Research & Apps

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Assisted migration is a means of introducing a species into a previously unoccupied area. Although this idea is relatively new for many species, there are many extant examples involving fish that can be instructive. We studied a case of assisted migration where upstream access of migrating adult coho salmon Oncorhynchus kisutch over a naturally impassible barrier was established through construction of fish ladders. Although these passage structures have successfully allowed coho salmon to colonize upstream locations, managers had concerns regarding how efficiently these structures passed fish, as well as questions regarding access to specific upstream habitats, and passage barriers further upstream. To address these concerns, we developed a stage‐based population model to explore: (1) influences of passage over structures, (2) rearing habitats upstream of the structures, and (3) consequences of additional barriers to passage in the system. Model simulations suggest high fish passage at the ladders was associated with the highest smolt and adult abundance of coho salmon. The importance of passage was strongly influenced by juveniles rearing in a lake, where increased lake rearing at each passage scenario increased abundance of smolts and adults. Opening habitat further upstream was estimated to increase adult and smolt abundance up to 12%. Results of model simulations also helped to identify uncertainties that could be evaluated further (e.g., juvenile rearing in the lake). In general, our findings point to the importance of considering a full range of processes that can drive expected outcomes for assisted migration.

show abstract

Assisted migration of coho salmon: Influences of passage and habitat availability on population dynamics

Benjamin,

Dunham,

Scheidt

et al. 2024

River Research & Apps

View full text Add to dashboard Cite

show abstract

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Passage of adult coho salmon (Oncorhynchus kisutch) over Lake Creek Falls, Oregon, 2019

Cited by 1 publication

References 19 publications

Assisted migration of coho salmon: Influences of passage and habitat availability on population dynamics

Assisted migration of coho salmon: Influences of passage and habitat availability on population dynamics

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