Wild Dolphin Welfare and Bycatch Entanglement

Entanglement in fishing gear is the leading human-caused welfare and mortality threat for wild cetaceans, with hundreds of thousands of dolphins and porpoises affected annually.

Key Facts

An estimated 300,000-600,000 cetaceans are killed by bycatch entanglement in fishing gear annually worldwide
Common dolphins are the most frequently bycaught cetacean in European Atlantic waters
Vaquita porpoises are critically endangered with fewer than 15 individuals surviving due primarily to gillnet entanglement
Entanglement causes death by drowning when animals cannot surface to breathe, typically within minutes
Non-lethal entanglement causes injuries including fin amputations, rope cuts, and infection from entanglement wounds
Acoustic deterrents (pingers) on gillnets reduce dolphin bycatch by 50-90% in trials
Observer coverage on fishing vessels — needed to document bycatch — covers less than 1% of fishing effort globally
The EU has set dolphin bycatch limits that were exceeded in French Atlantic waters in multiple recent years

Welfare Considerations

Bycatch entanglement represents one of the most significant sources of acute suffering for wild cetaceans. Drowning in a gillnet — unable to reach the surface — causes physiological distress measurable in blood chemistry and behavioral indicators in survivors. Non-lethal entanglement in heavy rope causes wounds that become infected and, in severe cases, sever fins and tails over time as the rope tightens. The population-level welfare impact across hundreds of thousands of individuals annually is staggering. Pinger technology demonstrates that technical solutions exist and are effective. The barrier is monitoring compliance — without observer coverage, pinger use and bycatch rates cannot be verified. Stronger monitoring requirements, satellite tracking of fishing effort, and binding bycatch limits with enforcement are the policy tools needed to drive meaningful improvement.

What You Can Do

Choose seafood certified by programs that include dolphin bycatch standards in their auditing
Support organizations like Oceana and the Whale and Dolphin Conservation Society working on bycatch reduction
Advocate for increased observer coverage on commercial fishing vessels to monitor bycatch
Contact retailers and restaurants about their seafood sourcing policies regarding dolphin-safe standards