This article is from page 11 of the 2014-05-20 edition of The Clare People. OCR mistakes are to be expected so download the original SWF or the rendered page 11 JPG
A HIGHLY invasive species of marine animals known as “marine vomit” has been discovered in the waters off the North Clare coast.
The National Parks and Wildlife Service (NPWS) says it is aware of the spread in south Galway Bay area of the carpet sea squirt known as Didemnum vexillum, a highly invasive non-native species that can smother marine life.
Didemnum vexillum are tiny animals in the tunicate family, that form together in massive colonies when conditions for breeding are suitable. These massive colonies spread quickly along the surface of the water, growing over and smothering anything in its path such as muscles, clams, oysters and plant life.
The marine vomit, which is given its names because of the colonies appearance as it spreads under water, is understood to have been carried to Clare from Japanese waters on the hulls of ships or in ballast wa- ter discharged from certain vessels.
It is not as yet clear if it will have a serious detrimental effect on the local shellfish populations, but tests carried out in waters close to Traught Beach on the Clare/Galway border indicate that it could pose a threat locally.
Indeed, these tests reveal a significant presence of marine vomit growing on the sea bed for the first time in Ireland. Up until now concentrations of Didemnum vexillum have been found on floating structures which cause little danger to other marine life.
Once the marine vomit become established it can spread rapidly. Indeed, the species could one day cover the entire of Galway Bay as was seen in George’s Bank between Canada and America where it now covers an area estimated to be more than 200 square kilometres.
Marine vomit has been located at more then six places around the Irish coast but Galway Bay now appears to be at the highest risk of invasion.