Goldfish
Carassius auratus
Hardy, long-lived classics that recognize their owners—perfect for UK tanks and ponds.
Essential Care Requirements
Temperature
18-22°C (65-72°F)
Water Quality
pH: 6.5-8.0
Ammonia: 0 ppm
Nitrite: 0 ppm
Diet
omnivore
2-3 times daily (small amounts)
Space Required
minimum tank: 150 liters (40 gallons) for first fish
additional fish: +75 liters (20 gallons) each
Behavior & Temperament
Temperament
peaceful, social
Activity
active during day
Social Needs
prefer groups of 3 or more
Personality
intelligent, can be trained, recognizes owners
Health Considerations
Common Health Issues:
- •swim bladder problems
- •ich (white spot)
- •fin rot
- •constipation
- •oxygen deficiency
Veterinary Care:
aquatic specialist when needed
Things to Consider
Advantages
- ✓Very long lifespan
- ✓Hardy and adaptable
- ✓Social and interactive
- ✓Can be kept in ponds
- ✓No heating required in UK
- ✓Intelligent and trainable
Challenges
- ✗Require very large tanks
- ✗Produce lots of waste
- ✗Can outgrow small setups
- ✗Often mis-sold as 'bowl fish'
- ✗Need excellent filtration
- ✗Live for decades (long commitment)
New Keeper?
Get the Exotic Pet Starter Guide — your UK handbook for correct lighting, diet, and care essentials. Make sure you have everything your pet needs to thrive.
UK-Specific Information
Climate
Well-suited to UK temperatures
Suppliers
Very widely available
Vet Availability
Some aquatic vets available
Legal Status
Illegal to release into wild waters
Based on UK DEFRA and CITES guidelines.
Ready to Care for a Goldfish?
Find a specialised exotic vet near you for professional advice.
