Selectively catalyzes the oxidative deamination of D-aspartate and its N-methylated derivative, N-methyl D-aspartate. Highest catalytic efficiency for D-Glu followed by D-Asp and NMDA. May play a role in the egg-laying events and early development of the worm, in addition to quality control of the germ cells. D-aspartate + H2O + O2 = H2O2 + NH4(+) + oxaloacetate Expressed in the intestinal cells, pharyngeal muscles, and body wall muscles in adult hermaphrodites. Expression detected in the intestinal cells from comma-stage embryo to adult stages, and also in the pharyngeal and body wall muscles from larva to adult stages. Mutant worms have decreased egg-laying capacity at 20 degrees Celsius and decreased hatching rate and smaller brood size at 25 degrees Celsius. Mutant worms also exhibit decreased fertilization rates but do not show any change in physical appearance. Belongs to the DAMOX/DASOX family.