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.
Sablefish
The sablefish ("Anoplopoma fimbria") is one of two members of the fish family Anoplopomatidae and the only species in the genus Anoplopoma. In English, common names for it include sable (USA), butterfish (USA), black cod (USA, UK, Canada), blue cod (UK), bluefish (UK), candlefish (UK), coal cod (UK), coalfish (Canada), beshow, and skil(fish) (Canada), although many of these names also refer to other, unrelated, species. In the US, the FDA accepts only "sablefish" as the Acceptable Market Name; "black cod" is considered a vernacular (regional) name and should not be used as a Statement of Identity for this species. The sablefish is found in muddy sea beds in the North Pacific at depths of and is commercially important to Japan.