Aquarium fish are among the most numerous captive animals globally, with welfare science demonstrating their capacity for pain, stress, and complex behavioral needs that commonly go unmet in home aquarium settings.
Aquarium fish welfare is constrained by a fundamental mismatch between how fish are perceived (as decorative objects requiring minimal care) and what fish welfare science reveals about their capacities and needs. The scale of the trade - hundreds of millions of animals - means that even modest improvements in average husbandry standards would benefit an enormous number of individuals. Welfare-centered aquarium keeping involves appropriately sized tanks, proper filtration, species-appropriate social groupings, environmental complexity that allows natural behaviors, and sourcing from sustainable captive-bred sources rather than wild-caught fish collected using damaging methods. The aquarium hobby community contains many knowledgeable enthusiasts whose practices could set higher standards.