Marine Mammal Entanglement: Policy, Prevention, and Rescue

Entanglement in fishing gear is one of the leading causes of marine mammal injury and death worldwide, affecting whales, dolphins, seals, and sea lions. Effective policy and gear innovation can dramatically reduce this toll.

Key Facts

The IUCN estimates that over 650 marine mammal species and subspecies are affected by bycatch and entanglement
The North Atlantic right whale faces extinction partly due to entanglement — fewer than 360 individuals remain
Entanglement in rope and netting causes drowning, starvation, chronic injury from embedded lines, and exhaustion
Ropeless fishing technology — where gear is retrieved by acoustic command rather than surface lines — eliminates vertical lines
Large whale entanglement disentanglement rescue by trained teams prevents deaths but is dangerous and resource-intensive
The US Marine Mammal Protection Act (MMPA) requires incidental take permits and sets bycatch reduction targets

Welfare Considerations

Entanglement causes prolonged, severe suffering. Whales and dolphins caught in rope or netting may survive for weeks or months with lines embedded in tissue, causing progressive wounds, infection, and weight loss. Drowning deaths are acute but no less agonising. The welfare dimension of entanglement policy is increasingly central to regulatory debates that previously focused only on population-level impacts. Disentanglement teams perform critically important welfare work but cannot scale to address the full scope of the problem — prevention through gear modification is the only systemic solution. Pingers (acoustic deterrents), weak links designed to break before animal injury, and the transition to ropeless fishing gear all represent evidence-based prevention strategies now mandated in some jurisdictions.

What You Can Do

Support organisations advocating for mandatory weak-link fishing regulations and ropeless gear transition funding
Choose seafood certified by programmes that require low-bycatch gear types (e.g., MSC with enhanced conditions)
Donate to marine mammal disentanglement response organisations such as the Center for Coastal Studies
Contact your elected representatives about strengthening domestic and international entanglement reduction standards