Researchers reviewed salmon reintroduction efforts involving Chinook, Coho, Sockeye and steelhead, drawing on scientific literature, case studies and expertise from federal, state, tribal, academic and private organizations. Of the programs implemented so far, 48 remain active, and 27 have operated for at least 20 years.
Climate & Environment1 week ago
Reintroduced salmon populations are stable or growing at many western sites
A review found that 81% of assessed populations showed stable or increasing numbers, while programs also restore cultural ties and carry risks that need attention.
What the review found
The review covered 51 Pacific salmon reintroductions and analyzed adult abundance trends for 26 reintroduced populations at 16 sites in the Pacific Northwest. Most of the populations in that analysis—81%—had stable or increasing abundance, which the authors say shows that reintroduction is reestablishing salmon populations in historical habitats. The programs can restore salmon access to habitats where they were previously lost, including cold-water headwater tributaries, and can help return marine-derived nutrients, support fisheries and provide prey for species such as sea lions and orcas. Tribal involvement was instrumental in many efforts, with a focus on restoring cultural, spiritual and ecological connections between Indigenous Peoples and salmon.
Why salmon return matters
Reintroducing salmon can do more than increase fish numbers. It may reconnect salmon with parts of their historical range, support other species and fisheries, and begin restoring relationships that are culturally central to many Indigenous communities. The review also stresses that decisions should consider both the risks of reintroduction and the continuing harm that can result when salmon remain absent.
Evidence and limits
This is a review and synthesis, not a single controlled experiment. The researchers combined published studies, case studies and expert knowledge, then examined abundance trends for 26 populations at 16 sites. The abstract does not provide a comparison group or details about the causes of each population trend, so the results show how reintroduced populations have changed but do not establish that reintroduction alone caused every increase. The review identifies the need to assess ecological and social risks, but the abstract does not quantify those risks or report outcomes for every program.
// Source
Transactions of the American Fisheries Society · 2026 · DOI: 10.1093/tafafs/vnag034
Authors: Tobias J. Kock, Claire E. Couch, Matthew L. Keefer, Andrew P. Matala, Casey M. Baldwin, Christopher C. Caudill, John W. Ferguson, Shubha N. Pandit, Chris Frederiksen, Todd Newsome, Thomas H. Kahler, Gabriel M. Temple, Jeffrey J. Duda, Russell W. Perry, R C Johnson, Bailey A. Morgan, Kathleen G. O’Malley, David A. Beauchamp, Mariah H. Meek, Caitlin L. Stockwell, Christopher M. Karchesky, Jason Roberts
Institutions: Oregon Department of Fish and Wildlife, University of Idaho, California Department of Fish and Wildlife, Douglas County Health Department, Western Fisheries Research Center, Confederated Tribes of Warm Springs, The Wilderness Society
