Invasive Species > Investigate Invasives - Marine
Invasive marine species
The Investigate Invasives campaign aims to identify non-native invasive species that threaten the habitats and native wildlife of Cornwall and the Isles of Scilly.
BACKGROUND
Both native marine life and marine based industries are under increasing pressure from the introduction of non-native invasive species. They find their way into our coastal waters through many pathways including ship ballast water, attachment to vessel hulls, activities associated with aquaculture and by careless disposal of imported species. Once here, they compete for resources such as space, light and food. In some cases native wildlife can be prey for the new arrivals. Lacking their own natural predators to keep them in check, the introduced species can become invasive and often displace native flora and fauna. This can have an economic impact for industry and conservation.
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Why are some species a problem?
Some marine invaders are already having a negative impact on British waters. The slipper limpet may look harmless, however they foul the shells of ediible shellfish, reducing their commercial value. They generate layers of sediment smothering native species and transforming habitat, rendering it unsuitable for recolonisation.
Wireweed can become established in shallow waters around beaches and harbours. It has been known to foul oyster beds and the nets of commercial fisheries. Wireweed can also clog up propellers and block water intakes.
The Carpet sea squirt, fouls fish spawning grounds and underwater structures such as pontoons, boat hulls and aquaculture equipment. It produces chemicals that deter many other faunal species and, although it predominantly settles on artificial substrates, there are concerns that natural reefs may be vulnerable to colonisation.
Once the carpet sea squirt takes hold it is difficult to eradicate. Watch this video footage of a treatment program taking place in Holyhead to remove it.
