Companion Animals

Aquarium Fish Welfare Standards

Fish are among the most neglected companion animals despite being the most numerous kept globally.

Key Facts

Over 700 million fish are kept as pets globally
Most pet fish live in environments far below their minimum welfare requirements
Fish are sentient and experience stress, fear, and pain
Overcrowding and poor water quality are the most common welfare problems in home aquariums

Welfare Considerations

Fish welfare in home aquariums is profoundly neglected. Most pet fish are kept in tanks too small, with inadequate filtration, inappropriate tank mates, and no enrichment. The widespread belief that fish have three-second memories and do not suffer is scientifically false — fish show learning, social complexity, and clear responses to painful stimuli. Educating new fishkeepers about realistic fish needs is a significant welfare priority.

What You Can Do

Research species-specific needs before setting up any aquarium
Provide adequate space, filtration, and species-appropriate tank mates
Never release aquarium fish into natural waterways
Support responsible sourcing of aquarium fish from captive-bred rather than wild-caught populations