Among all of the known species of freshwater fish, only about 1% of them are livebearing or viviparous. Despite their relatively low numbers, the livebearing fish is one of the most common fish among aquarists since its beginning. Some of the most common livebearer fish in the freshwater aquarium hobby are- guppy, platy, molly, swordtail, anableps, halfbeaks, mosquito fish, goodeids, and so on. All of the livebearing fish shares a common trait. Livebearer fish are…