The
Joint Nature Conservation Committee list Carmarthen Bay and Estuaries as a
Special Area of Conservation. This is a public body that advises the Welsh Government on international nature conservation. The area conserved includes sea inlets, tidal rivers, estuaries, mud flats, sand flats, lagoons (including saltwork basins), salt marshes, salt pastures, salt steppes, shingle, sea cliffs and islets. The sand and mud flats have large numbers of
bivalve molluscs including the
edible cockle. The large shallow inlets and bays provide habitat for a great variety of marine invertebrates. The saltmarshes have biodiverse communities of
glasswort (
Salicornis species),
dwarf eelgrass (
Zostera noltei),
sea rush (
Juncus maritimus) and
marsh-mallow (
Althaea officinalis) and all the wildlife they support. A primary reason for the listing is the presence in the bay of the
twait shad (
Alosa fallax), a migratory fish. ==Wind turbine testing in the 1980s==