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, hypodermis and in unidentified cells in the head in adult hermaphrodites. Expression detected in the intestinal cells from 3-fold stage embryo to adult stages, and also in the hypodermis and in unidentified cells in the head from larval 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 have high D-Asp and D-Glu content at both egg and young adult stage but do not show any change in physical appearance. Mutant worms also exhibit decreased fertilization rates. Belongs to the DAMOX/DASOX family.