Welfare of Fish in Public Aquaria

Public aquaria provide conservation education and research opportunities but face welfare challenges in providing appropriate environments for fish with complex space and behavioral requirements.

Key Facts

Over 600 million people visit aquaria annually worldwide, making them among the most visited wildlife facilities
Large pelagic fish including manta rays and whale sharks require enormous tanks that few facilities can provide
Fish in small tanks show repetitive swimming patterns indicating spatial restriction stress
AZA aquarium accreditation requires species-specific space requirements but does not yet have comprehensive fish welfare frameworks
Some aquaria have moved toward naturalistic habitat design that improves behavioral outcomes for housed fish

Welfare Considerations

Fish welfare in aquaria has received less attention than terrestrial animal welfare in zoos, despite fish being the most numerous vertebrate group in captivity. Fish confined to tanks smaller than their natural ranging behavior requires show swimming stereotypies and abnormal activity patterns. Large pelagic species including oceanic sharks and manta rays have essentially impossible space requirements for captivity. The transition to evidence-based fish welfare frameworks in aquaria is beginning with AZA and EAZA but trails mammal and bird welfare standards significantly.

What You Can Do

Support aquaria that demonstrate evidence-based fish welfare practices and naturalistic exhibit design
Oppose public display of large pelagic fish including manta rays in facilities without appropriate space
Advocate for fish welfare frameworks in aquarium accreditation standards
Learn about fish cognitive and behavioral needs to better evaluate aquarium fish wellbeing when visiting