The fillets, on sale at Safeway for the past 10 months, feature an image of a mountain terrain to reflect the Caledonian origins. But the image is of Mount Snowdon - more than 200 miles from the Scottish border.
Robin Parry, a GP from Llanberis, who spotted the error at the Safeway store in Caernarfon, North Wales, said: "I don't know if anybody has complained about it but I personally regard it as a something of local interest rather than an attack on Llanberis."
A spokesman for the Morrisons chain, which has taken over Safeway, said: "The packaging dates back to before we took over the stores and will be phased out as the branding transfers to Morrisons. I presume they saw a picture of a nice mountain scene but didn't realise it was Snowdon."