The lagoon is situated on the site of the old oysterbed workings. Following the dismantling of the railway, this site, to the west of the railway line, became a refuse dump and highways depot. Tipping ceased on the site in 1974. In 1980, a company approached the council with plans to restore shell fish farming. Planning permission was granted but the works were never completed and the company ceased trading in 1987. HBC undertook a major, award winning, project (1996/97) to clear the site and create a nature conservation site at the Oysterbeds. This was very successful and remains so today with many ground-nesting birds using the islands and bunds, surrounding the oysterbed site for breeding. This gives a very rare opportunity for residents and visitors to witness, at very close quarters, Little Tern, Common Tern, Sandwich Tern, Black-headed Gulls, Oystercatchers etc. in breeding colonies. Common Tern returning to the lagoon islands, at dusk, to roost for the night. During high tide, the waders in Langstone harbour have to find places to roost until the tide changes. Such space is at a premium and the bunds (or walls) around the oysterbeds can become packed with birds standing shoulder to shoulder. Flock of Dunlin arriving at a bund Dunlin, Turnstone and Grey Plover at their roost. Oystercatchers roosting on a bund.
More information on the development of the site can be found here.