Little is known specifically about the reproduction of R. glesne, but as a lampridiform fish, it probably lays large pelagic eggs of about 2-6 mm in diameter via broadcast spawning, which incubate at the surface for up to three weeks in some species (Paxton and Eschmeyer, 1998). Larvae have been found at the surface that have been identified as R. glesne (Bauchot, 1995).

Lampridiform embryos quickly develop into swimming larvae with long, distinctive rays on the pelvic and dorsal fins (Paxton and Eschmeyer, 1998).

Given seasonal changes in records, it is thought that R. glesne spawn between July and December (Bauchot, 1995).