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Significance In some monogamous species, the oxytocin system facilitates mating preference for a familiar individual, irrespective of sex. In contrast, in nonmonogamous species, the mating strategy mostly differs between males and females; males tend to compete with rival males and court indiscriminately, whereas females choose their mates selectively. Here, we studied the role of oxytocin in mate choice in medaka fish, a nonmonogamous species. Analysis of oxytocin system mutants in medaka revealed that the oxytocin system regulates mate preference in a sex-specific manner, indicating that the oxytocin system is required for mate choice in both sexes, regardless of the differences in the mating strategy between monogamous and nonmonogamous species.

Sexually dimorphic role of oxytocin in medaka mate choice