These are Boquerones make with anchovies, Not are sardines.
In English no translation for boqueron. It is a way typical of anchovies in Spain and here is common too. They are very tasty and acids, but not salty.
Boqueron is like anchovies but different flavor
Anchovies is cooked in salt, and then stored in oil
Boqueron is cocked in vinegar, and then stored in oil, but add garlic and presley or black pepper or sweet pepper, etc. There are several options preparation of boqueron.
Understand what I mean?