15/10/2026
🚨 These are sea lice. Parasitic crustaceans that target salmonids, the family of fish that includes Atlantic salmon and sea trout.
Millions infest open-net salmon farms and disperse into surrounding waters, where they attach to wild fish and progressively eat their skin and mucus to lethal effect.
A recent modelling study commissioned by WildFish demonstrates that sea lice from Scotland’s salmon farms merge, overlap and spread across tens of kilometres, creating a cumulative threat to wild salmon along their migration routes.
This means during a single migration, wild salmon can encounter parasites from multiple farms. For young fish, even a few sea lice can be deadly and mean they never reach the open ocean to feed and mature to adults.
With global wild Atlantic salmon populations in continued freefall, this cannot continue.
➡️ The Scottish Government must back wild salmon recovery and take urgent action to implement stronger regulations and address the harmful impacts of salmon farms on wild fish populations. A robust regulatory system, capable of assessing sea lice as a cumulative regional problem, not simply a site-specific one, must be implemented without further delay.
In the meantime, planning authorities should not consent to the development of new salmon farms or the expansion of existing sites.
At WildFish, we are committed to exposing the environmental harm caused by open‑net salmon farming and campaigning for meaningful evidence-led change that protects wild fish and their habitats.
Read the full sea lice report on our website 🔗 https://wildfish.org/latest-news/planning-system-ignores-salmon-farms-cumulative-risk-to-wild-fish/.