Rheoleiddir pysgota am gregyn bylchog yng Nghymru trwy Orchymyn Pysgota am Gregyn Bylchog (Cymru) (Rhif 2) 2010.  Mae’r rheoliadau’n gwahardd treillio am gregyn bylchog mewn sawl ardal o amgylch Cymru.  Mae’r ardaloedd hynny wedi’u diffinio’n glir o gwmpas arfordir Cymru ac maent wedi’u nodi’n rhai pwysig i rywogaethau a chynefinoedd bregus y môr.  Ni chaniateir pysgota am gregyn bylchog rhwng 1 Mai - 31 Hydref bob blwyddyn yn nyfroedd tiriogaethol Cymru.
Scallop fishing in Wales is regulated through the Scallop Fishing (Wales) (No.2) Order 2010. The regulations prohibit scallop dredging in several clearly defined areas around the Welsh coast which have been identified as important to vulnerable marine species and habitats. Scallop fishing is prohibited between 1 May – 31 October each year in Welsh territorial waters.