Aquatic mammals in captive settings face unique welfare challenges related to pool size, water quality, social complexity, and the mismatch between their natural environment and zoo conditions.
Aquatic mammals in captivity exist on a welfare spectrum depending on species and facility quality. Cetaceans, particularly dolphins and orcas, face the greatest welfare challenges due to the extreme mismatch between their natural environment - vast ocean ranges, complex social structures, and sophisticated echolocation use - and even the best captive facilities. Pinnipeds generally adapt more successfully to captivity when given appropriate social groups, complex environments, and positive reinforcement training. Pool water quality, temperature, and appropriate depth all affect welfare significantly. Positive reinforcement training not only enables veterinary care but provides cognitive stimulation that improves welfare indicators. The ethics of cetacean captivity remain actively debated in welfare science.