INVASIVE NON-NATIVE SPECIES FACTSHEET PICK AN ALIEN INVADER TO ACT OUT!


Marine Species


1. CARPET SEA SQUIRT is an animal that forms large colonies carpetting hard structures on which it grows.


2. WIREWEED is olive brown, grows to over 1 metre in length and is covered in small spherical gas bladders.


6. SLIPPER LIMPET has a whitish pink shell and is recognised by its half closed aperture and white projecting shelf.


Freshwater Species


8. QUAGGA MUSSELS are rounded with a brown stripey shell and their two halves meet with a wavy line.


9. KILLER SHRIMP are around 20mm long. They have striped backs and two cone shaped protrusions on the tail.


11. FLOATING PENNYWORT has shiny, kidney-shaped leaves with crinkled edges and is found floating on still or slow-moving fresh water.


A joint Royal Yachting Association and British Marine initiative


(Image Credits with thanks to: GBNNSS, CCW, SNH, John Bishop, David Aldridge, Richard Lord)


www.thegreenblue.org.uk ©The Green Blue 2015


5. DARWIN’S BARNACLE is small and white with four outer shell plates.


12. WATER PRIMROSE has a flower with 5 bright yellow petals and distinctive seed pods.


3. LEATHERY SEA SQUIRT is a wrinkly brown sea squirt with a small holdfast at the base and two siphons at the free end.


4. COMPASS SEA SQUIRT is an orange sea squirt with its siphon covered with four white stripes.


7. CHINESE MITTEN CRAB has a dense mat of hair on the claws, and an olive green body. Also found in coastal estuaries.


10. AUSTRALIAN SWAMP STONECROP is a perennial with yellowish-green leaves, over 20mm long and solitary white or pale pink flowers.


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