The data available for fish are fragmented, yet indicate that the KiSS1/GPR54 system is functionally conserved in non-mammalian vertebrates and supports the notion that it has a role in pubertal development and reproduction in piscine systems..     ///    The KiSS1/GPR54 system in fish..     ///    "As in mammals, the fish KiSS1/GPR54 system appears to be partially regulated by gonadal steroids. "    ///     The KiSS1/GPR54 system has now been identified in non-mammalian vertebrates. 