A long, serrated blade extends forward from between its eyes. This rostrum, the nose spine, gives the sabre prawn its name and its defence. It resembles a sabre, a curved sword, with teeth along both edges. When threatened, the prawn slashes sideways. It uses the serrated edges to deter predators. The spine is not for cutting. It is for warning. Threat is visual. Action is defensive. Survival depends on deterrence. Cold, subantarctic water defines its world. The sabre prawn lives in deep waters around the South Island and the subantarctic islands. It ranges from Cook Strait to the Campbell Plateau. It is most common on the Chatham Rise. It also occurs around the Auckland Islands. The water is cold. It is stable. It is rich with life. But it is remote. It is difficult to study. Depth isolates. Distance protects. One hundred to four hundred metres down, it lives. The sabre prawn inhabits deep continental slopes and seamounts. It prefers sandy and muddy bottoms with stable temperatures. It burrows into the sediment during the day. It hides from predators that hunt by sight. Only its antennae and the tip of its rostrum remain exposed. They monitor the water for danger. Concealment is total. Exposure is risk. At night, it emerges. The sabre prawn rises from the sediment. It begins to hunt. It feeds on small crustaceans, worms, and zooplankton. It uses its long, slender legs to pick prey from the water column and from the seafloor. Its body is pale pinkish-brown. This provides camouflage against the muddy bottom. When threatened, it flicks its tail. It shoots backward. It disappears into a cloud of sediment. Escape is rapid. Visibility is lost. The rostrum is its primary defence. Unlike the jack-knife prawn, which uses its serrated spine to dig, the sabre prawn uses its spine to fight. When a predator approaches, the prawn raises its rostrum. It slashes sideways. The serrated edges can wound a small fish. They can deter a larger one. It is not a guarantee of survival. But it improves the odds. Defence is active. Resistance is possible. No one targets it. The sabre prawn is not commercially fished in New Zealand. It is caught occasionally as bycatch in deep-sea trawl fisheries around the subantarctic islands. Boats target hoki and other species there. The bycatch is small. The prawn is usually discarded. Its sabre-like rostrum makes it easy to identify. But it is otherwise unremarkable. A pale prawn in the cold, dark water. Value is low. Interest is minimal. The subantarctic islands are remote and wild. The Auckland Islands, Campbell Island, the Antipodes. These are places where few humans ever set foot. The waters around them are rich with life. But they are harsh. They are unforgiving. The sabre prawn has adapted to this environment. It finds its niche on the deep continental slopes. It lives its short life in the cold, dark water. Far from the warm shallows where most prawns are found. Isolation is complete. Adaptation is specific. Climate change may alter this world. Warming waters affect the subantarctic islands more slowly than other regions. But the change is coming. As the water warms, the distribution of prey shifts. The sabre prawn may be forced to move to deeper, colder water. There is only so far down it can go. At some point, the slope ends. The abyssal plain begins. What happens then is anyone's guess. Uncertainty is inherent. Future is unknown. No one told it otherwise.