Despite their remarkable population recovery from commercial whaling, humpback whales face ongoing and emerging threats that require continued welfare attention even in populations that are no longer endangered.
Humpback welfare in the post-recovery era reveals a principle applicable to all recovered species: delisting from endangered status does not mean threats are resolved. Entanglement remains a significant source of individual welfare harm — humpbacks can drag fishing gear for weeks, developing rope injuries and behavioral changes from the constant physical burden. Ship strikes cause blunt trauma and propeller lacerations that kill outright or leave survivors with permanent debilitating injuries. The behavioral disruption from whale watching vessel approaches alters feeding and social behavior in ways that have energetic costs. Climate-driven prey shifts force whales into feeding areas with higher shipping and fishing gear density. Protecting humpback welfare in recovery requires maintaining pressure on multiple threat categories rather than reducing attention following delisting.