Jellyfish of New Zealand
Jellyfish are a diverse group of gelatinous zooplankton found throughout New Zealand's marine environments, from sheltered bays to open coastal waters. Several native and migratory species inhabit the country's Exclusive Economic Zone, contributing to marine food webs and occasionally impacting human activity through blooms and stings.
New Zealand's position in the temperate South Pacific supports a wide variety of jellyfish species. These organisms, belonging primarily to the phylum Cnidaria, class Scyphozoa, and class Cubozoa, are often seasonally abundant and can drift considerable distances due to ocean currents. Some species are native, while others appear periodically due to shifts in currents, climate, and water temperature.
| Common name | Scientific name | Where found | Sting |
| Lion's mane jellyfish | Cyanea capillata | Cooler southern waters, especially South Island coasts. | Painful, can cause irritation and welts, but not life-threatening. |
| Southern lion's mane | Cyanea annaskala | Temperate coastal waters, especially around the South Island. | Moderate sting, can cause discomfort. |
| Pink lion’s mane | Cyanea rosea | Found around the entire coast of New Zealand, as far south as Campbell Island. | Mild sting, rarely harmful to humans. |
| Moon jellyfish | Aurelia sp. | The commonest true jellyfish species in New Zealand and is found around the entire coastline. | Very mild or harmless to humans |
| Mauve stinger | Pelagia noctiluca | Usually found in oceanic deep water away from the coast but can swarm in large numbers and drift to the shore in late summer and winter around the northern waters of New Zealand, specifically Northland’s east coast and the Bay of Plenty. | Painful and irritating; can cause rash-like welts |
| Australian spotted jellyfish | Phyllorhiza punctata | Northern and eastern coastal waters, especially near harbours, blooms observed in Ōrākei Basin during February | Weak sting, usually harmless to humans. |
| Box jellyfish | Copula sivickisi | Has only been recorded only from Te Whanganui-a-Tara (Wellington Harbour), Wellington's south coast and Kaikōura. | Unlike many other box jellyfish species, this species is not known to be dangerous to humans. The stings are relatively mild, but may leave a blister-like wound. |
| Speckled jellyfish | Desmonema gaudichaudi | Widespread, recorded in waters around Leigh, the Firth of Thames, Auckland, Bay of Plenty, Wellington, Nelson, Marlborough Sounds, West of Coast South Island, Christchurch, Dunedin, Stewart Island, and is a known cold-water species from the Southern Ocean and Antarctica. | Can cause pain and irritation; not considered highly dangerous |
| Crimson immortal jellyfish | Turritopsis rubra | Found in shallow coastal waters, recorded from Bream Bay, Hauraki Gulf, Goat Island Marine Reserve, Whangateau Harbour, Waitemata Harbour, Wellington Harbour, Cook Strait, Hawke's Bay and Otago Harbour. | Mild, may cause itchy welts |