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.
Enneacanthus chaetodon
The black-banded sunfish ("Enneacanthus chaetodon") is a freshwater fish species of the sunfish family (Centrarchidae). They are found in the United States ranging from New Jersey to central Florida. The defining feature of this Black-banded sunfish is the black vertical strips that it has on both sides of its body. The term "Enneacanthus" comes from the Greek terms "ennea", which means "nine times", and "acanthi", which means "thorn". It is in a genus that consists of only three species along with the Banded Sunfish "Enneacanthus obesus" and the Blue-spotted Sunfish "Enneacanthus gloriosus". Collectively, they are commonly referred to as the "Banded Sunfish" or "Little Sunfish".