Mesonauta

Mesonauta is a genus of South American freshwater fish belonging to the family Characidae, commonly known as tetras. These small, schooling fish are native to the Amazon and Paraguay River basins. They are characterized by their slender bodies and a distinctive, often iridescent, stripe running along their sides. The name "Mesonauta" is derived from Greek words meaning "middle sailor," possibly referring to their swimming behavior or the prominent lateral stripe.

Several species are recognized within the Mesonauta genus, including Mesonauta insignis, Mesonauta festivus, and Mesonauta acora. They are typically omnivorous, feeding on small invertebrates, algae, and plant matter. In their natural habitat, Mesonauta species are often found in slow-moving, vegetated waters, such as tributaries, flooded forests, and lakes. Their schooling nature provides protection from predators.

Mesonauta fish are popular in the aquarium trade due to their attractive appearance and peaceful temperament, making them suitable for community tanks. They are relatively hardy but require clean water and a varied diet to thrive. Breeding in captivity is possible, with the fish laying eggs on plant leaves or other surfaces. The genus is of interest to ichthyologists for its evolutionary relationships within the diverse Characidae family and its ecological role in South American freshwater ecosystems.