巴西魮脂鯉

The <em>Hyphessobrycon agulha</em> is a small freshwater fish in the family Characidae, the characins — one of the most species-rich families of freshwater fishes, predominantly distributed across South America and Africa. Adults of this species typically reach a maximum length of approximately 4.31 cm. The genus <em>Hyphessobrycon</em> comprises numerous species commonly known as tetras, many of which are highly popular in the ornamental aquarium trade due to their vivid colouration and peaceful disposition. <em>Hyphessobrycon agulha</em> is likely associated with slow-moving or still freshwater environments such as forest streams, pools, and flooded areas — habitats typical of many characids within the Amazon basin and surrounding drainages. Details of habitat and range for this species remain limited in the ichthyological literature. The species epithet agulha, meaning needle in Portuguese, may refer to an elongated body form or slender profile characteristic of this fish. Characids in this size class are typically omnivorous, consuming small invertebrates, zooplankton, and plant material. As with many small Amazonian tetras, this species may form loose shoals in areas of dense aquatic vegetation, where schooling behaviour provides protection against predators in the wild.