burrows in the cold deep sediment

Size
Length: 8–12 cm, Weight: 10–25 g
Lifespan
3–5 years
Diet
Carnivorous. Feeds on small crustaceans, worms, and zooplankton. Hunts small prey on and just below seafloor using long, slender legs.
Habitat
Deep continental slopes and seamounts between 100 and 400 metres depth. Prefers sandy and muddy bottoms with cold, stable temperatures. Burrows into sediment during day.
Range
Found in deep waters around South Island and subantarctic islands from Cook Strait to Campbell Plateau. Most common on Chatham Rise and around Auckland Islands.
Endemism
Native
Main Threats
Bycatch in deep-sea trawl fisheries is primary threat. Habitat damage from bottom trawling poses risk. Climate change affects deep-sea ecosystems.
Population
Population trends poorly understood due to deep-water habitat. Not targeted commercially. Caught occasionally as bycatch. No formal stock assessment exists.
Conservation Status
Not Threatened
Human Risk
harmless
Handling Note
deep-water prawn, harmless to humans, leave undisturbed
Conservation Note
Native marine crustacean; not assessed by NZTCS as marine invertebrates are outside the scope of current threat classifications.
Te Ao Māori
The sabre prawn has no traditional Māori name or significance. It lives in deep subantarctic waters far beyond the reach of traditional fishing. Its name comes from its long, sabre-like rostrum. It uses this for defence. In modern times, it is known only to deep-sea researchers. Crews of trawlers who fish around the subantarctic islands also know it. It is one of the many species that live in New Zealand's remote southern waters. This region remains largely unexplored. History is silent. Science is recent. The prawn persists. It is unknown to tradition. It is known to the deep.
A long, serrated blade extends forward from between its eyes. This rostrum gives the sabre prawn its name and its defence. It resembles 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. Campylonotus rathbunae 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. Depth isolates. Distance protects. No one targets it commercially. It is caught occasionally as bycatch in deep-sea trawl fisheries. Boats target hoki there. The bycatch is small. The prawn is usually discarded. Its sabre-like rostrum makes it easy to identify. But it is otherwise unremarkable. Value is low. Interest is minimal. 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 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.