Predicted to enable apelin receptor activity. Involved in several processes, including apelin receptor signaling pathway; circulatory system development; and positive regulation of blood vessel endothelial cell proliferation involved in sprouting angiogenesis. Acts upstream of or within regulation of gap junction assembly. Predicted to be located in membrane. Predicted to be active in plasma membrane. Is expressed in several structures, including alimentary system; cardiovascular system; central nervous system; embryo mesenchyme; and reproductive system. Orthologous to human APLNR (apelin receptor). [provided by Alliance of Genome Resources, Apr 2022]