Interspecific hybridization between Oryzias latipes and Oryzias curvinotus causes XY sex reversal.

The teleost fish, Oryzias curvinotus, is a closely related species to the medaka, Oryzias latipes, and both species have the DMY gene, which is required for male development in O. latipes. It suggests that the molecular function of the DMY gene and the following molecular events of sex differentiation are conserved between these two species.