The marine aquarium trade collects millions of tropical fish from coral reefs annually using practices that cause significant mortality and welfare harm.
The marine aquarium trade imposes welfare harms on individual fish throughout a lengthy supply chain. Cyanide poisoning causes immediate toxic stress and internal organ damage that manifests as delayed mortality — fish appear fine at purchase but die weeks later from damage incurred during collection. Even fish collected without cyanide experience severe transport stress through multiple handling events, crowded holding conditions, and the physiological challenge of adaptation from reef to captive environment. Supply chain mortality rates mean that for every fish surviving to a home aquarium, at least one other collected fish has died. Captive breeding eliminates collection welfare harms for species where it is viable and should be prioritized by consumers. For wild-caught species, verified responsible collection certification provides the best available welfare assurance.