krill-like lobster drifting in open ocean swarms
- Size
- Length: 3–5 cm, Weight: 1–5 g
- Lifespan
- 2–3 years
- Diet
- Zooplankton and small crustaceans. Filters food from water using feathery appendages. Swims in huge surface swarms. Important food source for many fish, seabirds and marine mammals. Feeds most actively during daylight hours.
- Habitat
- Open ocean and coastal waters from surface down to 200 metres depth. Often forms enormous surface swarms visible from air as red patches on water. Prefers cold, productive waters with high plankton abundance for feeding.
- Range
- Coastal waters of South Island and southern North Island from Cook Strait to Stewart Island. Most common around Otago and Canterbury coasts. Also found in southern Australia and South America. Distribution follows cold currents.
- Endemism
- Native
- Main Threats
- Climate change affecting plankton populations is primary threat. Ocean warming may shift species range southward. No direct fishery for this species in New Zealand. Pollution and water quality degradation in coastal areas may affect larval survival rates.
- Population
- Population trends poorly understood due to natural boom-and-bust cycles. Lobster krill populations fluctuate dramatically from year to year depending on ocean conditions. In some years, they form enormous surface swarms. In others, they are absent.
- Conservation Status
- Not Threatened
The sea turns red. That is the first sign. Lobster krill is not a true krill. It is a small, lobster-like crustacean called a squat lobster. It looks like a tiny lobster, with claws and a flattened body. But it is not a true lobster either. The name is wrong twice. Taxonomy is messy. Common names are worse. Precision is rare.
Enormous surface swarms form in the waters around the South Island. The swarms are so dense that they turn the sea red. A living stain appears on the surface. It is visible from the air. Seabirds gather by the thousands. Dolphins and whales arrive to feed. The whole ocean comes alive. Energy concentrates. Predators respond. The system works.
These swarms attract everything that swims. Gannets dive from the sky. Shearwaters skim the surface. Seals plough through the red water, mouths open. The lobster krill are the fuel. The predators are the engine. Consumption is rapid. Transfer is efficient. The chain holds. For now.
Despite its name, it is not a krill. Krill are small, shrimp-like crustaceans that filter plankton. This is a squat lobster. It is a relative of hermit crabs. It feeds on detritus and small organisms. It is not a krill. It is not a true lobster. It is something else entirely. Classification fails. Function remains.
It is a vital part of the marine food web. It converts plankton into food for larger animals. Without it, the seabirds would starve. The dolphins would move on. The whales would go elsewhere. Dependence is total. Absence is catastrophic. The link is critical. Break it, and the web frays.
The Māori name is not recorded. It lives offshore, in the deep water. It is out of sight of the people who came before. They may have seen the red swarms from the shore. They may have wondered what caused them. Observation was possible. Explanation was not. Mystery persists. History is silent.
That is lobster krill. Not a krill. Not a lobster. Just a small, red, swarming crustacean. It turns the sea red. It feeds the ocean. It exists in bursts. It disappears in lulls. It is a pulse. It is a signal. It is a resource. No one told it otherwise. It swarms. It feeds. It vanishes. The cycle repeats. The sea changes colour. The birds arrive. The seals dive. The whales follow. And then it is gone. The red fades. The water clears. The hunger remains. The wait begins. Evolution rarely revises the draft. It just repeats it.