The goldfish is one of the most popular of all the fish kept as pets. They are a group of freshwater fish belonging to the Family Cyprinidae, Order Cypriniformes, and one of the earliest species of fish to be domesticated.
The myth that goldfish have a very short attention span has been making the rounds in the web and even among aquarists. However, research studies have shown that this is not correct. In fact, goldfish have been shown to have a memory that can last at least three months.