Rough estimates of D. dipterura abundance were calculated by Mathews and Druck-Gonzalez (1975) from the Bahía Magdalena lagoon complex, Baja California Sur, México based on trawl surveys. These authors noted a distinct seasonal trend in abundance within the lagoon complex and estimated 112,000 individuals present in February, increasing to 378,000 in August. Species identifications were problematic and these estimates may include D. longa or urotrygonid rays. In the Gulf of California, exploratory trawl surveys indicated that D. dipterura comprised 26% of the total demersal catch weight (Flores et al. 1995). No details on the abundance of this species outside of México are available.

In Chile, the southern extent of the species? distribution, and southern California, the northern extent of its distribution, this species is rare. In Chile, it is known only from three specimens taken in the north (Antofagasta). Its occurrence in these extremities of its range appears to be linked to suitable climatic conditions due to El Niño (Lamilla, et al. 1995, Ebert, 2003).

No information on subpopulations or fragmentation is available.

Unknown