Large amounts of weed are strewn along the beach at Porth Neigwl and Aberdaron at the moment, and no doubt the rest of the south beaches after these prevailing winds from that quarter... not been up north for a while.
Having said that, there are a few south coast stretches without this problem - like the mark I blanked at when plugging last night, but you would have to really know the sites (re: tidal flows etc) to find them.
Aberdaron was quiet on the rocks yesterday with one good pollack in 4 hrs of fishing. The pollack had been eating whitefish (poor-cod & rockling), rather than being stuffed with sandeels. No sign of the mackerel.
Rough weather breaking up the baitfish shoals, I reckon....