Harbour Porpoise Welfare and Threats

Harbour porpoises are Britain's most common cetacean but face significant welfare threats from bycatch, pollution and boat disturbance.

Key Facts

Harbour porpoise populations in UK waters are estimated at approximately 250,000 individuals
An estimated 1,000-2,000 porpoises are killed as bycatch in UK fisheries annually
Chemical pollutants accumulate in porpoise blubber affecting immune function and reproduction
Underwater noise from shipping and construction causes stress responses including swimming avoidance
Harbour porpoises show strong site fidelity and complex social structures

Welfare Considerations

Harbour porpoise welfare is affected by multiple human pressures simultaneously. Bycatch entanglement causes drowning or severe physical injury. Pollutant accumulation compromises immune function causing susceptibility to infectious disease. Underwater noise creates chronic stress equivalent in mechanism to persistent noise exposure in humans. Individual porpoises in busy shipping channels experience a fundamentally degraded acoustic environment compared to those in quieter waters. Welfare improvements require coordinated action on bycatch mitigation, pollution reduction and marine noise management across multiple regulatory domains.

What You Can Do

Support campaigns for mandatory pingers on fishing nets reducing harbour porpoise bycatch
Advocate for marine pollution reduction including persistent organic pollutants
Maintain appropriate distances from harbour porpoises if you encounter them at sea
Support marine protected area designations in key porpoise habitat reducing anthropogenic pressures