Clavelina oblonga

Clavelina oblonga

Family: Clavelinidae

Origin: Tropical western Atlantic ocean

Clavelina oblonga laid out on a white sheet of paper with a ruler beneath it.
Claveliva oblonga is a type of sea squirt.
Photo credit: Sam Happy

Regional Pest Management Plan (RPMP) status

  • Whole region — Sustained control

View more about the RPMP statuses

General description

A tunicate that forms large colonies.

What you need to know

To help protect our environment:

  • You must not breed, distribute, release or sell any clavelina oblonga within the Auckland region.
  • If you’re in charge of any craft in the Auckland region you must ensure that the level of fouling on the hull and in niches of the craft does not exceed ‘light fouling’.
  • If you’re in charge of any craft in the Auckland region you must ensure that it is free of all ballast water, bilge water, holding tank water or sea water held in any other container when entering any marine body from the land.


Hard surfaces such as marinas and rocky sub-tidal and inter-tidal habitats.

Impact on environment

This species is relatively newly documented as an invasive species, so its potential impacts are still uncertain. However, given its ability to form large colonies, it is likely to be able to outcompete native species and may impact upon the mauri of the moana.



Before moving your boat or other craft to new locations, make sure the hull, anchor chain and all other equipment on board is clean and free of marine pests or other fouling. Think about where you’re taking on or releasing ballast, bilge or holding tank water, or water in any other container such as chilly bins, to avoid spreading marine pests.

Find out more:

For more information on clavelina oblonga and how to avoid spreading them, please visit Prevent pests from spreading or contact Auckland Council at

A fleshy pale clavelina oblonga under water.
It is native to the southern Atlantic coast of North America and the Caribbean Sea.
Photo credit: Samantha Happy
Clavelina oblonga in a plastic bag.
Photo credit: Sam Happy