Common Seal Welfare and North Sea Population Decline

The common seal is smaller and less numerous than the grey seal in Britain, with populations concentrated in Scotland and East Anglia, and welfare concerns centred on disease outbreaks, pup disturbance, and North Sea prey depletion.

Key Facts

UK common seal numbers are around 40,000, affected by significant regional declines in Scotland
Phocine distemper virus killed around 50% of the North Sea common seal population in 1988 and again in 2002
Common seal pups can swim within hours of birth, unlike grey seal pups that need three weeks ashore
They haul out in mixed-species groups at traditional sand and mudflat sites around the UK coast
Declines in Shetland common seal numbers of over 80% since 2000 remain poorly understood

Welfare Considerations

Common seal welfare is threatened by phocine distemper outbreaks, prey depletion in the North Sea, and disturbance at haul-out sites. The mysterious Shetland decline may involve changing prey availability linked to climate-driven shifts in fish distributions. Disturbance at haul-out sites by kayakers, wildlife tourists, and dog walkers forces repeated flushing that disrupts rest critical for digestion and pup development. Drone surveillance is an emerging disturbance source requiring wildlife-sensitive operation guidelines.

What You Can Do

Maintain at least 100m distance from seal haul-out sites and follow NatureScot guidelines
Never operate drones near seal haul-out sites without appropriate wildlife disturbance assessment
Support Scottish Marine Animal Stranding Scheme for monitoring and research
Contribute seal count records to Sea Mammal Research Unit surveys
Back North Sea fisheries management that maintains prey fish stocks for seal populations