Goldfish are often dismissed as low-welfare pets requiring minimal care, but properly kept they live 15-25 years and require appropriate water quality, space and social conditions.
Goldfish in small bowls experience chronic ammonia and nitrite poisoning that causes gill damage, fin deterioration and suppressed immunity. Temperature fluctuations in unheated bowls cause stress and disease. Cramped conditions prevent normal swimming behaviour. The widespread cultural dismissal of goldfish welfare has led to millions of animals kept in conditions that cause daily suffering.