Cyflwynwyd y Parth Atal ar 25 Ionawr i leihau'r risg o haint yn dilyn tri canfyddiad ar wahân yn Lloegr o ffliw Adar Pathogenig Iawn H5N6 mewn Adar Gwyllt.
The Prevention Zone was introduced on 25 January to mitigate the risk of infection following three separate findings in England of Highly Pathogenic Avian Influenza H5N6 in Wild Birds.