Wild Harbor Porpoise Bycatch Welfare

How incidental capture in fishing gear affects harbor porpoise welfare and what technical solutions are reducing bycatch mortality.

Key Facts

Harbor porpoises are the most common small cetacean in North Sea and North Atlantic waters
An estimated 5,000 to 7,000 harbor porpoises die annually in fishing gear in EU waters alone
Gill nets pose the greatest bycatch risk because porpoises cannot detect them with their echolocation
Acoustic pingers attached to nets emit sounds that warn porpoises of net presence and have reduced bycatch by up to 90 percent
Death from net entanglement involves drowning, typically lasting several minutes of hypoxic struggle
EU regulations require pinger use on many gill net types but enforcement and compliance remain variable
Harbor porpoise populations in the southern North Sea have declined significantly due to bycatch and habitat disturbance

Welfare Considerations

Harbor porpoise bycatch represents a massive source of preventable acute suffering and population-level conservation harm. Drowning in a gill net is not a quick death; it involves minutes of struggle and hypoxia for an air-breathing mammal. Acoustic pingers are a proven, low-cost solution that dramatically reduces bycatch when properly deployed and maintained. The gap between available technology and widespread adoption is primarily one of regulatory enforcement and fishing industry compliance rather than technical feasibility. Stronger pinger mandates with genuine monitoring and enforcement would rapidly reduce porpoise suffering.

What You Can Do

Support campaigns for stronger enforcement of acoustic pinger requirements on gill nets in cetacean habitats
Choose seafood from fisheries with documented bycatch reduction measures and third-party observer coverage
Donate to marine mammal bycatch monitoring programs that generate the data regulators need to act
Advocate for transition from gill nets to less cetacean-harmful gear types in key porpoise habitats
Support harbor porpoise population monitoring to track bycatch impacts on local populations over time