Latest version published by Marine Biological Association on Mar 6, 2018 Marine Biological Association

The carpet sea squirt (Didemnum vexillum) is an invasive non-native species of colonial sea squirt that has recently been found in England, Ireland, Wales and at one location in the Clyde, on the west coast of Scotland. The potential ecological and economic impacts of this species are significant. A rapid response eradication programme in Holyhead Harbour is currently underway, showing signs of some success so far. However, it is not known how far this species has spread within the UK, and surveys are underway in England and Wales to determine its distribution. It is crucial to know as soon as possible how far it has spread, as this information will determine what the appropriate response will be - if it is confined to only a few sites, it may be possible to attempt eradication. If it is already more widespread, then containment or control measures will be more appropriate.No specific surveys targeting this species had previously been carried out in Scotland, so it was not known whether it was present just in the one marina in the Clyde or whether it was more widespread. This project involved a series of rapid assessment surveys of those marinas and harbours thought to be most likely at risk from establishment (e.g. those in the Clyde and on the west coast of Scotland) and will inform SNH’s policy for dealing with this species, as well as the wider UK policy for response.

Data Records

The data in this sampling event resource has been published as a Darwin Core Archive (DwC-A), which is a standardized format for sharing biodiversity data as a set of one or more data tables. The core data table contains 1 records. 2 extension data tables also exist. An extension record supplies extra information about a core record. The number of records in each extension data table is illustrated below.

  • Event (core)
  • ExtendedMeasurementOrFact 
  • Occurrence 

This IPT archives the data and thus serves as the data repository. The data and resource metadata are available for download in the downloads section. The versions table lists other versions of the resource that have been made publicly available and allows tracking changes made to the resource over time.


Download the latest version of this resource data as a Darwin Core Archive (DwC-A) or the resource metadata as EML or RTF:

Data as a DwC-A file download 1 records in English (12 KB) - Update frequency: not planned
Metadata as an EML file download in English (4 KB)
Metadata as an RTF file download in English (5 KB)


The table below shows only published versions of the resource that are publicly accessible.


Researchers should respect the following rights statement:

The publisher and rights holder of this work is Marine Biological Association. This work is licensed under a Creative Commons Attribution Non Commercial (CC-BY-NC) 4.0 License.

GBIF Registration

This resource has not been registered with GBIF




Who created the resource:

Dan Lear
Head of Data
Marine Biological Association of the UK Plymouth GB

Who can answer questions about the resource:

Data Archive for Marine Species and Habitats (DASSH)
Data Archive for Marine Species and Habitats (DASSH) Plymouth GB

Who filled in the metadata:

Data Archive for Marine Species and Habitats (DASSH)
Data Archive for Marine Species and Habitats (DASSH) Plymouth GB

Who else was associated with the resource:

Data Team

Additional Metadata

Alternative Identifiers http://www.dassh.ac.uk/ipt/resource?r=dasshdt00000150