balances on the edge of the splash zone

Size
Length: 2–3 cm
Lifespan
1–2 years
Diet
Algae and detritus.
Habitat
Rocky shores and splash zones above the high tide line.
Range
Throughout New Zealand on rocky shores.
Endemism
Native
Main Threats
Pollution and habitat disturbance.
Population
Common on rocky coasts throughout New Zealand.
Conservation Status
Not Threatened
Human Risk
harmless
Handling Note
terrestrial isopod in splash zone, no venom or biting mechanism
Conservation Note
Native sea slater common on rocky coasts throughout New Zealand, not subject to formal NZTCS threat classification.
Te Ao Māori
Sea slaters have no specific Māori name. They are part of the general coastal environment. Their presence indicates healthy rocky shore ecosystems. They are often overlooked. Small. Grey. Unassuming. But they are everywhere. On every rocky beach. A constant companion to the tide.
It is not an insect. It looks like one. Flat. Grey. Fast. But it breathes with gills. It is a crustacean. The New Zealand Sea Slater lives in the splash zone. Where waves break but do not submerge. It is a dangerous place. Too dry and it desiccates. Too wet and it drowns. It balances on the edge. Literally. Threats are minimal. Predators include birds and spiders. But the slater is quick. It flattens itself against the rock. It slips into cracks. It is hard to catch. Human activity poses a risk through pollution and habitat disturbance. Oil spills coat the rocks. The slater cannot clean itself. It dies. Slowly. Diet consists of algae and detritus. It grazes on the biofilm that coats the rocks. It is a cleaner. It removes organic matter. It recycles nutrients. It plays a small but vital role. Without it, the rocks would be slicker. Slimier. Less habitable for others. Range covers the entire coastline. It is found on both main islands. It tolerates a wide range of temperatures. It is resilient. It survives storms. It survives droughts. It survives winter. It is a survivor. By design. Habitat is the supralittoral zone. Above the water. Below the land. It hides under rocks during the day. It emerges at night. Or when the spray is heavy. It likes moisture. It needs it. Gills require dampness. Air is not enough. It seeks the spray. It chases the wave. Life span is one to two years. Growth is steady. Moulting occurs regularly. Each moult is a risk. Soft shell means vulnerability. It hides until hardened. Then it returns to the edge. To the spray. To the balance.