I've been checking out Mexican markets near me. All of them seem to have dried shrimp or teeny, tiny whole dried fish, none bigger than an inch long and many smaller.
Usually they will be on the meat counter in those quart-sized plastic deli tubs or sold in a big jar where you can order by weight I'm guessing.
The fish dont seem to have a uniform look to them. That is, they will be different at each market.
In all my Mexican food eating, I don't think I've knowingly eaten tiny dried fish or shrimp. The shrimp must be common since I was checking out the Mexican spice selection at Raley's supermarket and they were in with all the other spices.
How are these eaten?