This very small, "hole-in-the-wall" in size, fish market, is on Constitucion, directly across the…read morestreet from where the entrance and exit to the former Rizo's Supermercado were located.
Fish, other seafoods, and shellfish, arrive at the shop in the early-mornings (weekdays, and Saturday), and once unpacked, are set up for sale rather quickly by the staff. My favourite time to shop there is between 7-9am, when the products are out for sale, and the selections and freshness the best.
For me, it's been primarily a place to shop for shrimp. I find their selections are often 'the' best in the area -- allowing me to choose sizes graded from small to large, and at times, very large, with heads still attached. For us, I'm most often seeking "mediums" for our our cooking, but once in a while, the "small'' are great for cocktails, to use in sandwiches, stir-fries, and the like, and the "large" or "very large" can make some yummy dinner treats. The shrimp are priced by the kilo, and the friendly and accommodating staff will always provide you with as much or little as you wish.
I like this little pescaderia, have been shopping there for several years, and have never had a problem with the quality of products purchased.