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NRW release guidance on newly arrived Invasive Non-native marine species in Milford Haven



Carpet sea squirt (Didemnum vexillum) was recorded for the first time in Milford Haven in Autumn 2023 and recently confirmed by genetic analysis.


This species can have impacts on biodiversity and commercial use of the sea, as it can grow quickly and smother the shore, outcompete native species and negatively affect marine infrastructure.


The species can be found on the lower shore and can grow on pebbles and seaweeds. It is very important that if moving bait around Milford Haven or outside of Milford Haven into a new area, any material (e.g. packing material or water / pebbles) is not put back into the sea, where it could cause this species to move to a new area.  It should be left well above the high tide mark or disposed of in refuse.


For information on what you should do if you think you have Carpet sea squirt in your area, please see attached poster.




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