Original description as Characodon multiradiatus:
- Meek, Seth Eugene. 1904. "The fresh-water fishes of Mexico north of the isthmus of Tehuantepec". Field Columbian Museum Publication. pp. 1-252 (ffm00159)
Conservation: Girardinichthys multiradiatus is evaluated by the international union for the conservation of nature in the iucn red list of threatened species as (VU) vulnerable (1996). It is difficult to tell how stable populations of Girardinichthys multiradiatus are as there is no regular monitoring of the known habitats. Nevertheless, there are observations throughout the last decades that give an impression about the situation. John Lyons (2013:84) for example reported that from the sixteen historically known locations only seven persist. Many others are gone, maybe by extirpation by black bass or by pollution. This means a substantial decline in distribution and abundance of this species. On the other hand, man made presas may give the species an opportunity to inhabit new habitats. However the most dramatic impact may have hit the Río Lerma basin populations. Populations in the ríos Balsas and Pánuco basins are still present and the situation in the Zempoala lagoons seem to be stable as well. John Lyons reports the status of the species as vulnerable.
Last year (2014), Kees de Jong (2015) found that the population in the Maravatio spring, the westernmost population of this species, has declined dramatically, probably by the sudden appearance of introduced Guppys. In general, the introduction of non-native fish may be the biggest threat for the Dark-edged Splitfin as it seems to be not very competitive.