Platy (xiphophorus) is a very popular tropical freshwater fish species held by aquarists around the world. They are extremely beautiful, small fish and come in every single color!. Part of their popularity is due to the low maintence and easy care ,needed to keep them. Males grow to about 1.5 inches and females, being a little bigger, can grow up to 2.5 inches. Platies are native to both Central America and North America.