Nannostomus trifasciatus

Nannostomus trifasciatus, (from the Greek: nanos = small, and the Latin stomus = relating to the mouth; from the Latin: trifasciatus = three bands), commonly known as the three-lined or three-stripe pencilfish, is a freshwater species of fish belonging to the characin family Lebiasinidae. They are popular in the aquarium trade due to their small size, beautiful color pattern, and relative hardiness.