The common goldfish (carassius auratus), is the most popular fish to be kept by fishkeepers. These fish are also one of the cheapest fish on the market. These fish descended from wild carp and there are many goldfish varients in the world today.
This fish behaves like most fish. Nonagressive
This fish is a coldwater fish, so there is no need for a heater in the home aquarium. They can also live in ponds.