t: +44 (0)1248 712277; e: info@marine-ecosol.com  
Copyright Rohan Holt

Our experience covers a wide range of ecological surveys in temperate, tropical and sub-tropical climates, with a particular emphasis on United Kingdom waters and coastlines.

Marine Surveying & Monitoring Case Studies
Pilot eradication of invasive non-native seasquirt,
Didemnum vexillum

In 2008 the invasive non-native seasquirt Didemnum vexillum was discovered in Holyhead marina. Across the world, from St George's Bank off North America to oyster and mussel farms in New Zealand, this sea squirt has been making a pest of itself.  It overgrows the native animals and plants (including commercial oysters and mussels), and can then take a long 'pendular' form which means native species can no longer settle. Its life strategy means that it can out compete most things, and has no known predators. Marine EcoSol has been working with the Countryside Council for Wales to trial its eradication from Holyhead Marina, therefore curbing its impact on the local environment. This also involves monitoring the species movements in and around the harbour.

Watch more detail about the eradication project on You Tube:


or for more detail on Didemnum vexillum from the GB Non-Native Species Secretariat on You Tube:


For more detail on invasive non-native species in the UK see the GB Non-Native Species Secretariat at:


Didemnum Vexillum

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