Horse mussel reef is listed as a habitat of principle importance for the purpose of conserving biodiversity in Wales pursuant to section 42 of the Natural Environment and Rural Communities Act 2006.
Yn adran 42 Deddf yr Amgylchedd Naturiol a Chymunedau Gwledig 2006, mae riffiau cregyn dilyw’n cael eu rhestru fel cynefin pwysig iawn at bwrpas diogelu amrywiaeth fiolegol Cymru.