That one brings up a big smile ... had a good friend keeping his little yacht (a Contessa26) in Menai strait, Port Dinorwic. Visited him a couple of times to either do the tour of Anglesey or sail over to the Isle of Man for the TT races.
On one occasion we had the funny idea to hold a mussel competition, I would make them our way, he would do it his way, but then we had to find mussels first, and to our utter surprise they were ever so hard to find, the surprising thing was knowing on the Bangor side of Menai strait there were huge mussel seed trawlers operating all the time, so the seeds are there but no mussels.
At the end Tesco's in Bangor gave us the solution : mussels officially taken out of the Oosterschelde in Holland but sure as hell the seeds came out of Bangor. Now see how that will go.
p.s. my good friend conceded that I won the mussel contest hands down ... good times, pity he ain't there anymore, sic transit gloria (swanson)