Tens of thousands of dolphins and porpoises die as bycatch in commercial fishing operations annually. Technological solutions exist but adoption remains limited by economics and enforcement.
Dolphin and porpoise bycatch causes death by drowning - animals caught in nets cannot surface to breathe and drown within minutes to hours. Some animals may be alive when nets are hauled and experience decompression effects or die from injuries sustained during hauling. The chronic nature of bycatch mortality - affecting the same dolphin populations year after year - represents a significant welfare burden that is largely invisible to consumers of fish products. Animals that survive net contact may have injuries affecting their long-term welfare. The existence of effective technological solutions like pingers makes continued large-scale bycatch preventable rather than inevitable. The failure to mandate their use reflects economic and political priorities rather than technical barriers.