11 Facts About Goldfish

1. Goldfish are popular pond fish, since they are small, inexpensive, colourful and very hardy.

2. Goldfish is classified as a coldwater fish, and can live in unheated aquaria at a temperature comfortable for humans.

3. Goldfish can hybridise with certain other species of carp as well as C a gibelio.

4. Goldfish have learned behaviours, both as groups and as individuals, that stem from native carp behaviour.

5. Goldfish are gregarious, displaying schooling behaviour, as well as displaying the same types of feeding behaviours.

6. Goldfish have a memory-span of at least three months and can distinguish between different shapes, colours and sounds.

7. Goldfish have strong associative learning abilities, as well as social learning skills.

8. Goldfish have four kinds of cone cells, which are respectively sensitive to different colours: red, green, blue and ultraviolet.

9. Goldfish have one of the most studied senses of vision in fish.

10. Goldfish were first introduced to North America around 1850 and quickly became popular in the United States.

11. Goldfish is a freshwater fish in the family Cyprinidae of order Cypriniformes.