pencilfish

The Pencilfish is a common name given to several species of small, slender freshwater fish in the family Nannostomus. These fish are native to South America, primarily found in the Amazon and Orinoco river basins. They are characterized by their elongated, cylindrical bodies, which give them their "pencil-like" appearance, and are typically small, rarely exceeding 5 centimeters in length. Their coloration can vary depending on the species and their mood, but often includes horizontal stripes.

Pencilfish are generally peaceful and are popular in the aquarium trade. They are omnivorous, feeding on small invertebrates, algae, and detritus. In their natural habitat, they often inhabit slow-moving streams and vegetated areas. Breeding behavior can vary among species, but many are egg-layers. Their small size and schooling nature make them an attractive addition to community aquariums where they can be observed interacting with each other. Different species may exhibit subtle variations in body shape, finnage, and color patterns.