Tropical fish are among the most commonly kept pets globally, but aquarium conditions frequently fail to meet species-specific welfare needs, causing stress, disease, and premature death.
Tropical fish welfare begins before purchase — wild capture methods including cyanide stunning cause chronic organ damage. In aquariums, species-specific needs for water chemistry, temperature, group size, and tank size are frequently not met. Fish kept in inappropriate conditions show chronic stress that manifests as faded colours, hiding, abnormal swimming, and disease susceptibility. The marine aquarium trade in particular drives wild population pressure through wild capture. Better standards at point of sale, consumer education about species requirements, and investment in captive breeding reduce both welfare harm and conservation impact.