Image source: Luke Ovgard
Texas roundnose minnow (Dionda texensis) is a small freshwater fish belonging to the family Leuciscidae, the minnows, shiners and daces. The species is native to the Rio Grande drainage in Texas in the United States and northern Mexico.
The Texas roundnose minnow inhabits clear to moderately turbid streams and small rivers, usually over gravel, sand, or rocky substrates. It prefers flowing waters where algae and organic material grow on submerged surfaces.
Like other species of the genus Dionda, this fish feeds mainly on algae, diatoms and small aquatic invertebrates, which it grazes from rocks and other submerged objects.
The species has historically been confused with several closely related roundnose minnows, especially the Nueces roundnose minnow (Dionda serena), which occurs in the nearby Nueces River basin. Modern taxonomic studies clarified that Dionda texensis is primarily associated with the Rio Grande system.
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