Shark Bycatch in Longline Fisheries

Millions of sharks are caught as bycatch in commercial longline fisheries annually, suffering prolonged stress on the line before release or death.

Key Facts

An estimated 50-73 million sharks are caught as bycatch annually in commercial fisheries
Sharks caught on longlines may struggle for hours before the line is hauled
Post-release survival depends heavily on species, temperature, and time on the line
Circle hooks reduce shark bycatch in some longline fisheries by up to 90%
Shark finning often occurs as opportunistic secondary use of bycatch sharks

Welfare Considerations

Shark bycatch represents one of the most significant yet least-discussed marine welfare issues. Sharks caught on longline hooks experience prolonged exhaustion and stress as they struggle against the line, potentially for many hours before hauling. The physiological consequences including lactic acid buildup, metabolic disruption, and injury from the hook cause suffering that may continue even after release. Post-release survival rates vary enormously, with many released sharks dying from delayed mortality. Circle hooks, which cause fewer jaw injuries and are easier to remove, represent the most practical available mitigation.

What You Can Do

Choose seafood certified by fisheries with shark bycatch reduction measures
Support international shark bycatch monitoring and reporting requirements
Advocate for mandatory circle hook use in longline fisheries in shark habitat
Support sanctuary networks that protect sharks from all fishing pressure
Reduce consumption of tuna and swordfish, the species most associated with shark bycatch