A landmark DNA study spanning three decades has provided some of the strongest evidence yet that conservation stocking can help save endangered Atlantic salmon populations without compromising their ability to survive and return to their native rivers.

Researchers analysing the River Carron in Wester Ross found hatchery-reared salmon, bred from the river’s own native stock and released as juveniles, returned from the sea at rates comparable to naturally spawned fish. The findings resolve a long-standing question over whether conservation-stocked salmon can complete their life cycle as successfully as wild fish.

Bob Kindness MBE on the River Carron

Source: RCCA

Scientist Bob Kindness MBE inspects gravel movement on the River Carron from winter spates (sudden floods) that can wash out salmon redds (egg nests) and damage spawning habitat

The latest research, conducted by the UHI Inverness Institute for Biodiversity and Freshwater Conservation using genetic samples collected by the River Carron Conservation Association (RCCA), found that 40% of migrating smolts between 2016 and 2018 and 46% of returning adult salmon between 2017 and 2020 originated from the stocking programme.

Bob Kindness MBE, who established the River Carron restoration programme more than 30 years ago, said the findings could reshape conservation policy.

“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,” he said.

He warned that action is urgently needed as salmon populations continue to decline across Britain.

“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,” he said.

While researchers stress stocking is not a replacement for habitat restoration, they believe it can serve as a valuable ‘bridging strategy’ for rivers facing local extinction.

Describing the research as ‘a game changer’, veteran Spey ghillie and conservation campaigner Ian Gordon said: “This approach can help support salmon recovery without harming native populations, and it offers practical help now. That needs to be embraced.”

The RCCA is now calling for fisheries regulators to review stocking guidance in light of the new evidence.

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