Marine mammal sanctuaries for non-releasable animals offer welfare alternatives to display facilities, but require rigorous standards to provide genuine quality of life rather than minimal confinement.
Marine mammal sanctuary welfare is a critical emerging field as public pressure reduces tolerance for dolphin and whale display entertainment while the number of non-releasable animals increases. The key distinction between a sanctuary and a rebranded display facility is whether operations are organized around animal needs or human entertainment needs. Genuine sanctuaries minimize performance requirements, maximize natural behavior opportunity, provide animal agency in daily routines, and prioritize social groupings based on animal compatibility rather than display convenience. Sea-pen sanctuaries — large netted ocean bays where animals can experience natural water, tides, and environmental stimulation — represent a significant welfare advance over concrete tanks. The welfare science base for cetacean and pinniped captive management continues to develop rapidly.