[Ebook] The New Guide to Aquarium Fish – Cyprinodonts – Other Poeciliids
The knife livebearer has two rows of scales along the lower edge of the caudal peduncle which look like the blade of a knife. Pale in colour, the iridescent sheen on the bodies of healthy fishes makes them well worth keeping. Males grow to about 5 cm (2 in) and females 7.5 cm (3 in)
