Comet belongs to the variety of most common fancy goldfish. Their appearance is similar to the common goldfish but they are slightly slimmer and smaller. They are easily distinguished by their long forked tail.
The comet goldfish can be distinguished from the common goldfish by its long, single and deeply forked tail fin. Under optimum conditions, the tails can grow up to 12 inches in length. The red coloration mainly appears on the tailfin and dorsal fin, but can also appear on the pelvic fin