DNA evidence shows salmon restocking programmes can build viable wild populations
Salmon reared in hatcheries can survive and thrive in the wild, according to research carried out for a conservation programme on a Scottish river where wild salmon were on the brink of extinction.
New DNA analysis of a conservation study spanning three decades on the River Carron in Wester Ross, northern Scotland, shows that 40% of smolts migrating to sea between 2016 and 2018, and 46% of rod-caught adults returning between 2017 and 2020, had originated from the River Carron Salmon Stock Restoration Programme.
The River Carron Conservation Association (RCCA) said the study resolves one of the most persistent doubts about conservation stocking: whether hatchery-reared fish can survive migration to the ocean and return home as successfully as wild salmon.
Scientist Bob Kindness MBE is the architect of the 30-year programme to restore the native salmon population in the River Carron. He received his MBE for services to conservation in the 2026 King’s Birthday Honours.
He said: “This has provided some of the strongest field evidence yet that conservation salmon stocking, carefully designed around scientific principles using native broodstock and released at early life stages, can help sustain Atlantic salmon in rivers where populations have reached critically low levels.
“These findings are likely to intensify calls for fisheries policy to adapt rapidly as Atlantic salmon populations continue to collapse across Britain.”
Native Atlantic salmon in Great Britain was classified as Endangered on the IUCN (International Union for Conservation of Nature) Red List in 2022, with some river populations already considered extinct.
The Carron riparian owners have funded the 30-year restoration programme. DNA research by UHI Inverness Institute for Biodiversity and Freshwater Conservation was funded by the Wild Fisheries Fund.
In the latest phase of research, the UHI Inverness Institute for Biodiversity and Freshwater Conservation analysed genetic material and other data collected by the River Carron Conservation Association (RCCA) over more than a decade.
Their findings indicate that salmon bred from the river’s own native stock, then released as juveniles at an early stage of development, survived at sea and returned at rates matching wild-spawned fish.
Previous research had shown that by breeding from wild fish caught each season, rather than breeding from females in captivity for multiple years, it is possible to mitigate some of the genetic hazards associated with stocking programmes.
Bob Kindness warned about complacency, however: “Once a unique salmon population adapted over generations to a specific river’s conditions is lost, it is virtually impossible to re-establish. Time is critical and for some rivers conservation stocking may now be the only realistic way to preserve those native genetics.”
Restocking as a ’bridging strategy’
Wild salmon experts stress that stocking has several risks, is not a substitute for habitat restoration or wider environmental recovery, and that its appropriateness needs to be assessed according to the conditions of each river. The RCCA argues, however, that it could be a potential “bridging strategy” for some endangered river systems, to buy time while longer-term measures to address ecological conditions take effect.
Kindness said, “Salmon populations have declined even in rivers with ample high-quality habitat, as was the case in the Carron, where repeated winter flooding washed out spawning nests and left few young fish to survive the gauntlet of predators. On other rivers, our method could sustain populations long enough to allow habitat restoration and other remedial actions to take effect, in the hope of enabling full, natural, self-sustaining populations to thrive.”
Spey ghillie and salmon conservation campaigner Ian Gordon described the findings as “a game changer” for the industry he describes as in a “dire” situation compared to when he began 50 years ago.
“What Bob has done here is historic,” said Gordon. “This approach can help support salmon recovery without harming native populations, and it offers practical help now. That needs to be embraced.”
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