Fish are among the most commonly kept pets globally, yet their welfare is often poorly understood. Evidence that fish experience stress and have complex behavioural needs challenges the assumption that they require only water and food.
Pet fish welfare is chronically underestimated because fish are perceived as unfeeling and unresponsive. In reality, fish in inadequate conditions experience chronic stress - elevated cortisol, altered immune function, and reduced lifespan. The typical goldfish bowl provides inadequate water volume, no filtration, temperature instability, and no opportunity for natural behaviour. Shoaling species kept alone show stereotypic swimming patterns that indicate stress. The barrier to better fish welfare is primarily owner knowledge - most people who keep fish carelessly are not malicious, they simply do not know that fish have welfare needs that deserve serious attention. Education and better retail guidance are the most impactful interventions.