fish · Cyprinidae
Goldfish
Carassius auratus
Wild range: East Asia (Asia)
At a glance: Goldfish care
Compiled reference information. Review the care notes and original sources below.
What temperature is listed for Goldfish?
The compiled profile lists 1.0–35.0 °C for Goldfish (Carassius auratus). Check the original sources below for context and differing recommendations.
What tank size is listed for Goldfish?
The profile lists a minimum tank volume of 40.0 US gallons (151.0 liters). Volume alone does not establish suitability; consider dimensions, group size and other inhabitants alongside the full care notes.
What pH is listed for Goldfish?
The compiled profile lists a pH of 6.0–8.4. Review the cited care sources alongside the other water parameters in this profile.
Natural habitat
Goldfish prefer ponds and slow-moving water bodies where they can exhibit their natural behaviors. They thrive in well-oxygenated water and enjoy temperatures that fluctuate slightly throughout the year, reflecting their temperate nature.
Where they are found
Goldfish have been naturalized in many regions across the world, including areas with tropical climates. They were originally bred from wild carp found in East Asia.
Aquarium care
Goldfish require a minimum tank size of 40 gallons, especially for common/comet varieties. They produce a significant amount of waste, necessitating a high-capacity filtration system and regular water changes to maintain water quality. Maintaining appropriate water parameters is crucial; ammonia and nitrite levels should always be at 0, with nitrate below 40 ppm.
Feeding
A varied diet of high-quality pellets and occasional gel food is recommended to prevent gastrointestinal issues common among fancy varieties. Take care to choose food appropriate for their mouth size and avoid floating foods that may not be easily accessible to all goldfish types.
Compatibility
Goldfish tend to get along well with many other peaceful freshwater species. However, their size and waste production necessitate careful selection of compatible tank mates. Avoid small or very active fish that may become stressed around goldfish.
Breeding
Breeding goldfish is possible in suitable conditions, typically requiring a temperature of around 26°C. Spawning usually occurs after cooler water changes, often involving the collection of eggs for rearing in a separate tank.
Sources
Compiled from multiple independent care sheets — not copied from a single site.