Hammerhead sharks face severe population declines from targeted fishing for their fins and bycatch in pelagic fisheries, with welfare consequences for one of the most distinctive and ecologically important shark species.
Hammerhead welfare harms from shark finning are acute and severe. Finned sharks that remain alive after fin removal cannot swim effectively and sink to the ocean floor, where they suffocate or are consumed alive. This is a prolonged death — potentially lasting hours — for an animal that must keep moving to breathe. Bycatch entanglement and drowning, while faster, also cause significant suffering. Beyond direct harvest, hammerheads caught and released in recreational fishing experience barotrauma, exhaustion, and physiological stress that impairs survival even when released alive. The CITES listing creates documentation requirements for fin trade but enforcement is inconsistent. Consumer choice — refusing shark fin products and choosing fisheries with low bycatch rates for other seafood — provides the most direct market leverage available to individuals.