Predicted to enable GDP phosphatase activity; UDP phosphatase activity; and ribonucleoside triphosphate phosphatase activity. Predicted to be involved in nucleoside diphosphate catabolic process. Predicted to be located in membrane. Predicted to be active in plasma membrane. Is expressed in Rohon-Beard neurons; brain; cranial ganglion; heart; and liver. Orthologous to human ENTPD3 (ectonucleoside triphosphate diphosphohydrolase 3).