How to identify exotic caulerpa
Two different exotic caulerpas - Caulerpa brachypus and Caulerpa parvifolia – have been found in NZ. They are closely related and appear identical.
They have green fronds up to 10 centimetres long in the shape of oar blades that rise from long runners or roots known as stolons.
They can be found growing below the tideline at between 2 metres and 35 metres deep and on both hard surfaces and in sandy areas. When established, exotic caulerpa can cover large areas of the seafloor in dense mats.
Our video and images of caulerpa, both in the sea and washed up on shore, will help you recognise the seaweeds.
Video: How to identify and report exotic caulerpa – YouTube
Caulerpa ID guide for divers and other ocean users [PDF, 3.7 MB]
Tell us if you find any exotic caulerpa
Keep an eye out for exotic caulerpa species and report suspected sightings to us. Take a photo, if possible, and note the location. Then either:
- freephone 0800 809 966
- or complete the online form at report.mpi.govt.nz
