Coral reef fish display remarkable cognitive abilities, social complexity, and behavioral flexibility, raising important welfare questions about the impacts of reef degradation, aquarium collection, and recreational fishing.
Reef fish welfare is challenged by both human-caused mortality and ecosystem degradation. The ornamental fish trade involves collection by cyanide stunning in some regions — cyanide causes tissue damage and delayed death in many captured fish. Transport conditions in the aquarium trade involve prolonged confinement, oxygen depletion, and disease exposure. Recreational catch-and-release fishing on reefs, while producing less direct mortality, causes injury and stress responses. Reef degradation from bleaching and acidification eliminates the habitat complexity that reef fish require for shelter, feeding, and reproduction, creating a chronic welfare crisis at ecosystem scale. Captive-bred reef fish for the aquarium trade represent a welfare improvement over wild-caught individuals.