Pescadería Zamora in Los Alcázares is a great place to go if you are looking for fresh seafood. With a wide selection of fish, shrimp, lobster, and other products from the sea, you can be sure to find something that you like. The staff is very friendly and patient, even if your Spanish is not the best. They also offer excellent quality at a very reasonable price. The store is always full, but they are quick to serve you. The seafood is always fresh and the service is top-notch. Highly recommended for anyone who loves seafood!
Whenever I visit Los Alcázares (outside the summer, of course) I stop by this fantastic fishmonger to see what fish they have from the area and see different species than those common in Madrid. Very well stocked and kindly attended by its fishmongers. The price, as you already know, the quality (and the extractives) is expensive but not abusive. A pleasure to enjoy that fish when you are already at home hundreds of kilometers from the Ribera del Mar Menor