Bluefin Tuna Aquaculture Welfare

Atlantic and Pacific bluefin tuna are now farmed in significant numbers. Their welfare needs are complex and not fully addressed by current practices.

Key Facts

Bluefin tuna are apex predators that naturally travel thousands of kilometres
Farming involves either catching juvenile wild fish for fattening or full-cycle hatchery production
Wild-caught ranched tuna show extreme stress responses including net strikes during capture
Tuna require oxygen-rich water and continuous swimming to survive
Rapid chilling before slaughter appears to reduce pre-slaughter stress in tuna
Full-cycle farmed tuna hatchery production reduces wild capture impact
Price premiums for bluefin create economic pressure that can maintain poor welfare conditions

Welfare Considerations

Bluefin tuna welfare in aquaculture represents one of the most challenging problems in fish welfare science. Their highly active, pelagic lifestyle is fundamentally incompatible with cage culture. Wild-caught ranched tuna experience extreme acute stress during capture. Pre-slaughter welfare standards are developing but far behind those for salmon. Given tuna price premiums, the industry has capacity to invest in welfare improvements if regulation requires it.

What You Can Do

Avoid farmed bluefin tuna given unresolved welfare concerns unless from certified welfare-positive producers
Ask sushi restaurants and retailers about the source and welfare standards of their tuna
Support regulatory requirements for welfare assessment in bluefin tuna aquaculture
Reduce overall tuna consumption given both welfare and conservation concerns