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Didemnum vexillum - Holyhead Harbour, Wales, Images



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December 12, 2008
 

Holt, R., Ramsay, K., Mowat, S., Kent, F., and Griffith, K., 2009, Survey of non-native ascidian (sea squirt) Didemnum vexillum in Holyhead Harbour:  Countryside Council for Wales Marine Monitoring Report No. 67, 24 p. (PDF format)

Image RH_HH_WAL001, tunicate colony of D. vexillum
Image RH_HH_WAL001.

Image RH_HH_WAL001. Tunicate colonies of Didemnum vexillum overgrowing solitary tunicates Ciona intestinalis on pontoon chain.  Holyhead Marina, North Wales (53 deg 19.173 min W, 04 deg 38.488 min W).  Depth 2-6 m.  December 12, 2008.  Identified by Stephen Mowat (CCW) and Kate Griffith (CCW).  Photo credit:  Rohan Holt (CCW). Map Location no. 95
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Image RH_HH_WAL002, tunicate colony of D. vexillum
Image RH_HH_WAL002.

Image RH_HH_WAL002.Tunicate colonies of Didemnum vexillum overgrowing solitary tunicate Ciona intestinalis on pontoon chain.  Holyhead Marina, North Wales (53 deg 19.173 min W, 04 deg 38.488 min W).  Depth 2-6 m.  December 12, 2008.  Identified by Stephen Mowat (CCW) and Kate Griffith (CCW).  Photo credit:  Rohan Holt (CCW). Map Location no. 95
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Image RH_HH_WAL003, tunicate colony of D. vexillum
Image RH_HH_WAL003.

Image RH_HH_WAL003. Tunicate colonies of Didemnum vexillum overgrowing pontoon chain; note dark brown fecal material in cloacal apertures.  Holyhead Marina, North Wales (53 deg 19.173 min W, 04 deg 38.488 min W).  Depth 2-6 m.  December 12, 2008.  Identified by Stephen Mowat (CCW) and Kate Griffith (CCW).  Photo credit:  Rohan Holt (CCW).  Photo credit:  Rohan Holt (CCW). Map Location no. 95
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Image RH_HH_WAL004, tunicate colony of D. vexillum
Image RH_HH_WAL004.

Image RH_HH_WAL004. Tunicate colony of Didemnum vexillum overgrowing solitary tunicates Styela clava and Ciona intestinalis on pontoon chain; note dark brown fecal material in cloacal apertures.  Holyhead Marina, North Wales (53 deg 19.173 min W, 04 deg 38.488 min W).  Depth 2-6 m.  December 12, 2008.  Identified by Stephen Mowat (CCW) and Kate Griffith (CCW).  Photo credit:  Rohan Holt (CCW). Map Location no. 95
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Image SM_HH_WAL005, tunicate colony of D. vexillum
Image SM_HH_WAL005.

Image SM_HH_WAL005. Tunicate colonies of Didemnum vexillum overgrowing solitary tunicates Ciona intestinalis and Ascidiella aspersa on rope hanging from pontoon.  Holyhead Marina, North Wales (53 deg 19.173 min W, 04 deg 38.488 min W).  Depth 1 m.  December 12, 2008.  Identified by Stephen Mowat (CCW) and Kate Griffith (CCW).  Photo credit:  Stephen Mowat (CCW). Map Location no. 95
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HG_HH_WAL006, tunicate colony of D. vexillum
Image HG_HH_WAL006.

Image HG_HH_WAL006. Tunicate colonies of Didemnum vexillum overgrowing colonial encrusting bryozoan Umbonula littoralis, other organisms,  and boat hull.  Holyhead Marina, North Wales (53 deg 19.173 min W, 04 deg 38.488 min W).  Depth 1 m.  December 12, 2008.  Identified by Stephen Mowat (CCW) and Kate Griffith (CCW).  Photo credit:  Harry Goudge (MES). Map Location no. 95
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HG_HH_WAL007, tunicate colony of D. vexillum
Image HG_HH_WAL007.

Image HG_HH_WAL007. Tunicate colonies of Didemnum vexillum overgrowing solitary tunicate Ascidiella aspersa on boat rudder fouled by brittle stars, bryozoans, hydroids, kelp, and solitary tunicates Styela clava and Ciona intestinalis.  Holyhead Marina, North Wales (53 deg 19.173 min W, 04 deg 38.488 min W).  Depth 1 m.  December 12, 2008.  Identified by Stephen Mowat (CCW) and Kate Griffith (CCW).  Photo credit:  Harry Goudge (MES). Map Location no. 95
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HG_HH_WAL008, tunicate colony of D. vexillum
Image HG_HH_WAL008.

Image HG_HH_WAL008. Tunicate colonies of Didemnum vexillum overgrowing solitary tunicates Ascidiella aspersa and Ciona intestinalis and the tube of the Peacock worm Sabella pavonina on a boat hull and propeller shaft.  Holyhead Marina, North Wales (53 deg 19.173 min W, 04 deg 38.488 min W).  Depth 1 m.  December 12, 2008.  Identified by Stephen Mowat (CCW) and Kate Griffith (CCW).  Photo credit:  Harry Goudge (MES). Map Location no. 95
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