The bluntnose stingray has generally nocturnal habits and spends much of the day buried in the substrate. It has been known to follow the rising tide to forage in water barely deep enough to cover its body. This species preys upon small invertebrates, including crustaceans, annelid worms, and bivalve and gastropod molluscs, and bony fishes. It mainly targets benthic and burrowing organisms, but also opportunistically takes free-swimming prey. In Delaware Bay, this species feeds predominantly on the shrimp "Cragon septemspinosa" and the blood worm "Glycera dibranchiata", and its overall dietary composition is virtually identical to that of the roughtail stingray ("D. centroura"), with which it shares the bay. The bluntnose stingray is preyed upon by larger fishes such as the bull shark ("Carcharhinus leucas"). Known parasites of this species include the tapeworms "Acanthobothrium brevissime" and "Kotorella pronosoma", the monogenean "Listrocephalos corona", and the trematodes "Monocotyle pricei" and "Multicalyx cristata".