Carpet sea squirt
Photo credit: ©Julia Nunn
- Marine hard surfaces. The colonies have been found at water depths ranging from intertidal to continental shelf depths of 65m (213 ft).
- Exact identification of this species is very difficult and can only be undertaken by a trained expert. However, in general native species are not found in large colonies and do not form the candlewax-like dripping structures, as seen in the photographs. Please see the Habitas website on Sponges of Britain and Ireland for more info on native species.
- The invasive form can be describes as long, ropey or beard-like hanging from hard surfaces such as docks, aquaculture facilities, and ship hulls, or may be found as extensive mats covering rocky sea beds (pebbles, cobbles, boulders, and rock outcrops).
- It can reproduce from fragments and can complete a generation cycle within a week.
- Download N.I.E.A. ID guide
Origin and Distribution:
- Uncertain at present.
- The species is known from The Netherlands and France in Europe while worldwide the species is now recognised in Asia, Australasia-Pacific, Europe, and North America.
- Alter marine habitats.
- Interfere with fishing, aquaculture, and other coastal and offshore activities.
- Increased fouling of manmade structures such as docks, moorings, and boat hulls.
- Overgrow other organisms such seaweed, scallops, mussels, and oysters that depend on the seafloor for habitat.
- May impact on underwater archaeological sites such as ship wrecks. Produce noxious substances that deter most fish and other animals.
How did it get here?
- Uncertain at present.
- Likely vector is fouling of ocean going vessel and/or contamination of aquacultre produce.
Is it found in Ireland or Northern Ireland?
- It is present in Ireland and Northern Ireland. The species was recorded in Strangford Lough, County Down (NI) during October 2012.
- More information can be seen on NBDC and NBN Atlas NI.
You can help by reporting any sightings:
- If it is in Northern Ireland @ the Centre for Environmental Data & Recording (CEDaR) - Or via the iRecord App.
- If your sighting is in Ireland please report @ the National Biodiversity Data Centre (NBDC).
Static Distribution Map as of December 2019 - Courtesy of CEDaR
- Prevent fouling of boats and equipment.
- Clean all equipment including boats before moving to new waterbodies.
- Report all sightings.