Bathynomus giganteus is a species of deep-sea isopod in the family Cirolanidae, commonly known as the giant isopod. It is a large benthic crustacean native to the cold, deep waters of the western Atlantic Ocean, particularly the Gulf of Mexico and the Caribbean Sea, typically found at depths of 170 to over 2,000 meters. The genus name Bathynomus derives from the Greek bathys meaning “deep” and nomos meaning “dweller” or “inhabitant,” referring to its deep-sea habitat, while the species epithet giganteus is Latin for “giant,” describing its unusually large size compared to most isopods.

Although primarily known as a scavenger of the abyssal seafloor, feeding on carrion such as fish and cetaceans, Bathynomus giganteus has entered contemporary culinary curiosity in parts of East and Southeast Asia where it has occasionally been prepared in specialty restaurants or food exhibitions as an exotic deep-sea delicacy. Its taste is often compared to a cross between lobster and crab due to its crustacean lineage. Bathynomus giganteus provides edible muscle tissue from the thoracic segments and tail, similar in anatomical culinary logic to lobsters and large shrimp. It is typically steamed, boiled, or used in soups to extract umami-rich broth. While not traditionally consumed in Atlantic regions where it is native, it has become associated with novelty seafood cuisine in Japan, Taiwan and Vietnam, where deep-sea organisms are sometimes marketed for gastronomic experimentation.

Nutritionally, like other marine crustaceans, it contains significant levels of eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA), omega-3 fatty acids associated with anti-inflammatory and cardiovascular benefits; astaxanthin, a carotenoid antioxidant responsible for red pigmentation upon cooking; chitin in its exoskeleton, which can be processed into chitosan with biomedical and dietary applications; and free amino acids such as glycine and glutamate that contribute to sweetness and umami flavor. It also contains trace minerals such as zinc and selenium. As with many deep-sea scavengers, bioaccumulation of heavy metals is a potential concern depending on habitat, making sourcing and environmental context relevant to food safety considerations.