Yellowfin Tuna Welfare in Purse Seine Fisheries

Yellowfin tuna are large, fast, wide-ranging fish caught in enormous numbers by purse seine vessels. The welfare impacts of capture, handling, and crowding in these fisheries are significant and poorly regulated.

Key Facts

Global yellowfin tuna catch exceeds 1.5 million tonnes annually, mostly from tropical purse seine fisheries
Yellowfin tuna are highly active, warm-blooded fish that suffer severe stress when confined — heart rates spike dramatically during capture
Crowding in purse seine nets causes physical injury from collision with other fish and the net walls
Associated object (FAD) fishing aggregates large numbers of juvenile fish and bycatch species alongside targeted tuna
Tuna may remain alive and conscious in nets for hours before being brailed aboard and processed

Welfare Considerations

Yellowfin tuna are among the most physiologically stressed of all commercially caught fish. Their highly active metabolism and cardiovascular system mean that confinement, crowding, and handling in purse seine operations cause acute physiological crisis. The prolonged period between net closure and final death — often many hours — represents a sustained period of suffering. Welfare improvements are technically challenging at industrial scale but include faster brailing and processing, reduced net soak times, and investment in more humane kill methods. Consumer pressure for transparently sourced, lower-impact tuna products creates market incentives for improvement.

What You Can Do

Choose pole-and-line or troll-caught tuna, which have lower bycatch and faster, less stressful capture methods
Look for MSC certification and read the fishery assessment to understand bycatch and handling practices
Support organisations advocating for fish welfare standards in industrial tuna fisheries
Reduce tuna consumption or shift to plant-based alternatives to decrease demand for high-volume industrial fishing