Many accounts are incomplete although new information is being added continuously.
Errors do occur.
Users are cautioned to refer back to the original cited source to assess completeness and correctness before using the information. Web updates are intermittent, not continuous, therefore some dynamic information such as legal status may not be absolutely current. The Mexican tetra is the only characid occurring naturally in the United States. In most New Mexico streams, the species is so rare that its role in community structure is obscure. Historical records suggest that this and other small, cold-intolerant species once regularly migrated up the Pecos River and Rio Grande where they survived in upstream localities until they were eliminated by a severe winter.