Acoustic deterrent devices and modified fishing gear reduce dolphin bycatch in small pelagic fisheries, improving dolphin welfare.
Dolphins entangled in gillnets experience drowning stress and traumatic injury. Pingers that alert dolphins to net presence prevent the majority of entanglements at low cost. Compliance enforcement is the primary barrier to welfare benefit at scale. Circle hooks also reduce dolphin bycatch in longline fisheries. Each avoided entanglement represents prevented welfare harm and death.