Goldfish are among the most commonly kept pet fish but are often housed in conditions that cause significant welfare deficits.
Goldfish are frequently kept in bowls and small tanks that cause severe welfare deficits. Ammonia buildup in small unfiltered tanks causes chemical burns to gills and skin. Undersized environments cause chronic stress and stunted development. The fairground tradition of giving goldfish as prizes results in high mortality from inadequate care. These intelligent fish show boredom in bare environments and benefit from enrichment.