Goldfish (Carassius auratus) is an aquarium species. Its recorded origin is Europe. Adults may reach approximately 48.0 cm. It is generally kept in groups of 5 or more.

Temperature Safety Tips:
- Optimal Comfort: 15°C–21°C for standard single-tail varieties like common goldfish and comets
- Avoid Sudden Changes: Rapid shifts of more than a few degrees can shock or kill your fish.
- Pond vs. Indoor: Common goldfish adapt well to outdoor ponds through winter, but backyard ponds must be deep enough so the entire volume does not freeze solid.