The marine and freshwater aquarium fish trade involves millions of fish annually with welfare costs during collection, transport, and retail that require better oversight and standards.
Aquarium fish welfare problems are concentrated in the collection and transport phases where mortality is highest. Cyanide use, rough handling, overcrowded transport bags, and inadequate acclimation cause massive losses and suffering. The hobbyist who finally receives a surviving fish may be unaware of the welfare cost of the journey that fish has survived.