Although the female guppy is not as colorful as the male guppy, there are also requirements in the selection: the fish body is shiny, transparent, without black body, stout body, big tail, dynamic and healthy swimming posture, and there is no shortage of fins and carrion.
Old fish is characterized by hunchback, dark body and dull. Although it can still produce small fish, the resistance of the produced small fish will be poor.