Enables gonadotropin-releasing hormone receptor activity. Acts upstream of or within G protein-coupled receptor signaling pathway. Predicted to be located in membrane. Predicted to be active in plasma membrane. Is expressed in brain; eye; female organism; gonad; and male organism. Human ortholog(s) of this gene implicated in hypogonadotropic hypogonadism 7 with or without anosmia. Orthologous to human GNRHR (gonadotropin releasing hormone receptor) and GNRHR2 (gonadotropin releasing hormone receptor 2 (pseudogene)).