Marine Animals

Ocean Sunfish and Pelagic Fish Welfare

The welfare of large pelagic fish like ocean sunfish is poorly understood but increasingly relevant as bycatch and captivity become issues.

Key Facts

Ocean sunfish (Mola mola) are the world's heaviest bony fish, reaching 2,300 kg
They are frequent bycatch in Mediterranean swordfish and tuna fisheries
Sunfish in aquaria rarely survive long-term due to stress and injury
They consume primarily jellyfish and face threats from plastic bag ingestion
Studies suggest fish have nociceptors and can experience pain-like states

Welfare Considerations

Large pelagic fish like sunfish are extremely vulnerable to capture stress. Their cardiovascular and immune systems are easily overwhelmed by the trauma of netting, hauling, and holding. The documented decline in physiological function under capture conditions, combined with evidence for fish sentience, suggests that bycatch mortality represents a significant but largely unrecognized welfare problem.

What You Can Do

Support bycatch reduction technology research and implementation
Choose seafood certified by programs with bycatch reduction standards
Reduce seafood consumption to lower demand driving bycatch
Support legislation requiring bycatch reporting and reduction
Educate others about the breadth of marine animals affected by fishing