Comet is one of artificially bred ornamental tank goldfish, which has a classical elongated body (not an oviform shaped like all other representatives of this kind have) and a long tail.
Aquarium fishes: Goldfishes
Goldfishes care guide
Over the years goldfish (lat. Carassius auratus) has been the most popular, renown and favorite tank fish among aquarists. This is the fish that set the stage for aquarium husbandry appearance. In this article you will find detailed history of how the first goldfish was bred as well as how to keep, feed, care and breed the fish. All breeds are also described, we added photos of them and a short list of their distinctive features.