Enables D-aspartate oxidase activity and FAD binding activity. Involved in D-amino acid catabolic process. Acts upstream of or within several processes, including aspartate metabolic process; grooming behavior; and insemination. Predicted to be located in cytosol. Predicted to be active in cytoplasm. Is expressed in several structures, including alimentary system; chordamesoderm; nervous system; respiratory system; and sensory organ. Orthologous to human DDO (D-aspartate oxidase). [provided by Alliance of Genome Resources, Apr 2022]