Lipid cyprinidae? Charophyceae? Nematobrycon, a genus of fat carp with silk tail? tropical fish
What is the picture below? South American silk-tailed fat carp
It is 4 cm long or slightly larger, with a stout body and changeable body color. The whole body is lead-gray, and the center of the body axis is a double-row belt: the bottom of it is a striking thick black belt, and the black continues to the center of the caudal fin; The top is mixed with blue purple or blue ribbon. Although Diwangdeng fish is a lipid carp, it has no lipid fin (the second fin at the back) and its tail handle is long, so its gluteal fin is very long. The caudal fin of Diwangdengyu is triangular, and there is an elongated caudal filament in the center. The color is connected with the black belt of the body axis, all of which are black.
Distributed in the San Juan River valley in Colombia, South America, it is elegant in appearance and colorful and can be used as an ornamental fish.