Gwynedd
14 on record in Gwynedd.
| Name | Type | Locality |
|---|---|---|
| Anglesey – Red Wharf Bay | processor exporter | Bangor |
| Bwydmor Abersoch Seafood | processor exporter | Pwllheli |
| Menai Straits - East | processor exporter | Bangor |
| Menai Straits - East | processor exporter | Bangor |
| Menai Straits - East | processor exporter | Bangor |
| Menai Straits - East | processor exporter | Bangor |
| Menai Straits - East | processor exporter | Bangor |
| Menai Straits - East | processor exporter | Bangor |
| Menai Straits - East | processor exporter | Bangor |
| Menai Straits - East | processor exporter | Bangor |
| Menai Straits - East | processor exporter | Bangor |
| Menai Straits – West | processor exporter | Bethel |
| Myti Mussels Ltd | purification centre | Llithfaen |
| Ross Shellfish | dispatch centre | Gwynedd |