Cormorant Conflict Management and Welfare

Cormorants are colonial waterbirds that have recovered strongly across Europe and North America following protection, leading to growing conflicts with fishing interests and calls for lethal control — but welfare-friendly alternatives exist.

Key Facts

Great cormorant populations in Europe grew from 10,000 pairs in the 1970s to over 200,000 pairs by the 2010s following legal protection
Cormorants can consume 400-600g of fish per day and have been blamed for impacts on both wild fish stocks and aquaculture
Studies show cormorant impact on fish stocks is often overstated and localised, varying greatly by water body type
Non-lethal deterrents including acoustic scaring, netting, and visual deterrents can reduce cormorant presence at fish farms
Many lethal control programmes have limited long-term effectiveness as dispersed birds return or new individuals fill vacancies

Welfare Considerations

Culling cormorants raises significant welfare concerns, particularly when shooting leads to non-lethal injuries, chick starvation following parent death, or dispersal to other sensitive sites. Welfare-conscious management prioritises non-lethal deterrence, roost modification, and evidence-based evaluation of impact before any lethal control. Dialogue between conservation groups, anglers, and fish farmers can produce locally tailored management plans.

What You Can Do

Oppose blanket cormorant culling licences without evidence of significant localised impact
Support research into non-lethal cormorant deterrence methods at aquaculture sites
Advocate for site-by-site impact assessment before any lethal control is authorised
Engage fishing and conservation stakeholders in collaborative management planning