 <unk> in nature , the plain maskray feeds mainly on <unk> shrimp and polychaete worms , and to a lesser extent on small bony fishes . It is viviparous , with females producing litters of one or two young that are nourished during gestation via histotroph ( " uterine milk " ) . This species lacks economic value but is caught incidentally in bottom trawls , which it is thought to be less able to withstand than other maskrays due to its gracile build . As it also has a limited distribution and low <unk> , the International Union for Conservation of Nature ( IUCN ) has listed it as Near Threatened . 
