Grangemoor Quay – Based higher up on the River Ely Penarth Marina – a development of a former commercial dock. The marina predated the barrage, so yachts need to pass through the marina's own locks as well as the barrage locks to reach the sea. Motorsport The barrage was used as a special stage during the 2010 Wales Rally GB. Impact on the ecology of the bay Birds According to two studies published in 2006, the loss of intertidal mudflats has resulted in the numbers and diversity of the birds using Cardiff Bay greatly reducing. Almost all of the common shelduck and shorebirds that used the bay when mud was exposed no longer feed there. Initially these birds used nearby sites to feed, but in most cases, this behaviour was not sustained, and the birds were unable to settle elsewhere. Common redshanks displaced from Cardiff Bay settled at the nearby Rhymney estuary, but they exhibited lower body weight, and their annual survival rate declined from 85% to 78% as a result of lower levels of winter survival. Algae The freshwater lake had problems with blue-green algae initially which made it impossible to swim in the water or participate in water sports. These issues have now largely been resolved though some toxic algae remain in some of the dock areas in the bay. Zebra mussels Cardiff Bay has become the first area of freshwater in Wales to be infested with zebra mussels – an alien species to the UK which multiplies rapidly to the detriment of native marine life. The Cardiff Harbour Authority has decreed that "Personal watercraft" used in Cardiff Bay such as kayaks, canoes and sailing dinghies must be washed down with bleach solution before being taken to any other area of freshwater. Views of the barrage See also Severn Barrage Mersey Barrage References External links Cardiff Bay Barrage on cardiffbay.co.uk Tidal barrages Barrage Redevelopment projects in Cardiff Public art in Wales Dams in Wales Coast of Cardiff Buildings and structures in Penarth