In the 11 areas studied, even where conditions were good, seagrass faced damage from mooring or anchoring boats, said researchers Benjamin Jones and Richard Unsworth of Cardiff and Swansea universities. Seagrass meadows are regarded as a valuable habitat on British shores, particularly as a nursery ground for fish.were affecting the health of seagrass meadows at all but two areas. Seagrass, which is found in shallow waters of coastal regions, is declining globally at a rate of about 7% a year.