I've long been somewhat aesthetically taken with with mussels and their cultivation, visual as well as gustatory; here's a previous photo post about them.
This went a stage further on looking down at the mussel beds from the air. We must have been quite lucky with the state of the tide, so that their serried rows hovered visible just below the surface in the aqua- and ultramarine of the bay, their graphic, human-ordered geometry offsetting the random figuring and curves of the rocks and shoreline.
I took a lot of pictures of these, and make no apology for including a lot of them here.
Studying the satellite imagery of the coast here also, it becomes apparent just how extensive the mussel fields are, miles and miles of inshore waters delicately striated with them. One tends to think that human dominion ends at the edge of the land, that the islands stand in untamed ocean where fishermen and mariners take their chances on the surface, whereas often they are almost joined to the mainland by areas of miticulture, plotted and marked out by human agency, made mysterious in their partial concealment by the rise and fall of the tide.
I've heard though, that shell fish in general and mussels in particular, as well as being good and healthy food are relatively sustainable and ecologically benign in their cultivation, especially compared with rapacious over-exploitation of totally wild fish species or other more toxic forms of fish farming, which I rather hope is true, as not only do I love eating them but find the sight of the mussel beds rather beautiful and fascinating.