Common Seal Eastern UK Population Welfare

The common (harbour) seal population in eastern England has declined by over 30% since 2002 for unknown reasons, raising significant welfare and conservation concerns.

Key Facts

Common seal populations in The Wash and around the east coast of England have declined dramatically since 2002
The cause of decline remains poorly understood but may include disease, reduced prey availability, and disturbance
Phocine distemper virus (PDV) has caused mass mortalities in common seals historically, most recently in 1988 and 2002
Seals in The Wash are subject to disturbance from ecotourism, fishing activity, and coastal development
Grey seal populations in the UK have continued to grow during the same period, suggesting a species-specific problem

Welfare Considerations

Individual common seals in declining eastern populations face welfare challenges from reduced prey availability, disease pressure, and recreational disturbance at haul-out sites. Seals that are disturbed repeatedly at haul-outs — where they rest, give birth, and suckle pups — expend energy fleeing and may abandon pup-rearing. Entanglement in fishing gear causes drowning or limb entrapment injuries. The unknown cause of the eastern England decline makes targeted welfare interventions difficult but maintaining quiet haul-out zones and reducing bycatch risk in areas with known seal use are precautionary measures justified by the declining trend.

What You Can Do

Maintain distance from seal haul-outs to avoid causing disturbance that disrupts resting and pup-rearing
Report injured or dead seals to the British Divers Marine Life Rescue (BDMLR)
Support research into the causes of common seal population decline in eastern England
Follow Wildlife Code guidance for responsible wildlife watching near seal colonies