Koi
The major named varieties include:Goldfish (金魚) were developed in China more than a thousand years ago by selectively breeding Prussian carp for color mutations. By the Song dynasty (960–1279), yellow, orange, white, and red-and-white colorations had been developed. Goldfish ("Carassius auratus") and Prussian carp ("Carassius gibelio") are now considered different species. Goldfish were introduced to Japan in the 16th century and to Europe in the 17th century. Koi, though, were developed from common carp in Japan in the 1820s. Koi are domesticated common carp ("Cyprinus carpio") that are selected or culled for color; they are not a different species, but a subspecies, and will revert to the original coloration within a few generations if allowed to breed freely.
Gold panda molly
The Gold panda molly is a molly found in the aquarium trade. The molly is thought to have been a hybrid of the gold dust molly and possibly the Dalmatian molly. It most likely does not live in the wild. The sailfin molly ("Poecilia latipinna") is included in the cross, and some breeders have considered the Latin name of the gold panda molly to be "Poecilia latipinna".