The goldfish (Carassius auratus auratus) is one of the most beautiful and versatile species of fish. It is the most attractive creature in an aquarium. It makes the surrounding pleasant and lively due to its attractive appearance and dynamic movements. It originally came from China and it was introduced to Europe during the late 17th century. Nowadays, it can be found everywhere in slow-moving waters through rivers, lakes, ponds, freshwater and indoor pools and aquariums.