How long are goldfish?

Goldfish can vary greatly in size depending on their species and living conditions. Here's a breakdown:

Common Goldfish (Carassius auratus)

* Average: 6-12 inches (15-30 cm)

* Maximum: Up to 18 inches (46 cm)

Fantail Goldfish

* Average: 8-12 inches (20-30 cm)

Comet Goldfish

* Average: 12-18 inches (30-46 cm)

Other Varieties:

* Oranda, Ryukin, Telescope, etc.: Can reach sizes similar to Common Goldfish.

Important Factors:

* Tank size: A larger tank allows for more space to grow.

* Water quality: Poor water quality can stunt growth.

* Diet: A balanced diet contributes to healthy growth.

* Genetics: Some varieties are naturally larger than others.

Overcrowding:

* Goldfish are prone to growing larger in larger tanks.

* Overcrowding can lead to stunted growth and health issues.

Keep in mind: The lifespan of a goldfish can be 10-20 years, so they can grow quite large over time.