I guess that you have not used 'search' to find the decent threads.
Fishing in Fuerteventura, Caleta de Fuste and Lanzarote, Playa Blanca is generally brilliant.
I have never, in ten years, blanked once!
See - 'Lanzarote fishing' 12/08/12,
or use the 'search' page.
'Lanzarote' brings up hundreds. 'Playa Blanca, Lanzarote' brings up less but the info is all there.
From my own experience of fishing for over fifty years and much of the world (I was twelve years in the Royal Navy), my favourite holiday fishing place is Playa Blanca in Lanzarote.
I almost always, every session, catch something worth eating and put loads back. I admit there are times of the day when I know the tide, weather, etc is wrong for fishing but I'm still happy to sit with a couple of bottles and a couple of ham & cheese rolls and just see what happens. Still always catch something.
I now try and target different species to add to my list of fish caught.