@ Bolas: Fish available on Iberian Peninsula
1stly, thanks for the lovely photos.
Here are a few names of the fish / shellfish that could correspond to the Rock Fish, you are mentioning:
1) Hurta ( prounounced Urta ): called Banded Bream in English, Pargo Sémola in Portuguese, Sar Royal in French and in Latin, the species is called : Pagrus Auriga. This Rock Fish is found along the Cádiz and Huelva Coast of the Atlantic, in Spain. It is a wonderful white firm fish and highly esteemed in Andalusia.
To my knowledge, this is the only Rock Fish that would match the ones in your fotos.
2) John Dory: This fish is common along the Costa Brava on the northeast coast of Catalonia.
*** note it is called Pez de San Pedro in Spanish and Saint Pierre in French.
3) Date Shell Mussels: a slim mussel which embeds itself on the rocks, is called Dátil de Mar. They are under protection now. I had them years ago before living in Madrid. Very delicate flavor.