Common Seal Welfare: Entanglement, Pup Mortality, and UK Population Decline

Common seals are declining in several UK populations despite legal protection, with entanglement in fishing gear, disease outbreaks, and disturbance at pupping beaches causing welfare harms and population pressure.

Key Facts

UK common seal populations have declined by over 30% in some areas since the early 2000s — the cause remains under investigation
Phocine distemper virus (PDV) caused mass mortality events in 1988 and 2002, killing tens of thousands of seals
Common seals pup in June-July; pups must be able to swim immediately and bond closely with their mother in the first days
Disturbance at pupping beaches by people, dogs, and boats causes mother-pup separation and pup abandonment

Welfare Considerations

Common seal pups separated from their mothers by human disturbance face rapid starvation — they cannot survive without maternal milk in the first weeks of life. Pups entangled in fishing line or netting sustain progressive injuries as they grow into constricting material. Adults entangled in creel lines or ghost gear can drown or develop severe neck lacerations. Phocine distemper virus causes respiratory failure and systemic disease with prolonged suffering before death. Seal rehabilitation requires specialist facilities and extended intensive care — common seals are among the most demanding patients in UK wildlife care.

What You Can Do

Keep dogs on leads and stay 100m or more from common seal haul-outs and pupping beaches
Report entangled or sick seals to British Divers Marine Life Rescue (01825 765546)
Advocate for fishing gear modifications that reduce seal entanglement, including creel line modifications
Donate to Cornish Seal Sanctuary and other BDSM-affiliated seal rehabilitation centres