This is the smallest public mercado that I have seen so far in Ecuador.
It is located a few blocks from the main street and one block off the beach. There were at least three vendors selling several different types of fish including corvina (sea bass), pargo (red snapper) and two different sizes of shrimp one heads on and one without, and calamari. Prices seemed to be what I have found in Playas maybe a bit less with the heads on shrimp going to $3 to $3.50 for medium to large 20-24 to the pound.
I was fascinated to see one man selling fresh from the cow, unpasteurized milk in a plastic bag. He must have a home garden with tomatoes, beans and fresh baby cilantro. He comes to the Mercado to sell his vegetables each day. He looked to be over retirement age and this is probably his only income.
There were a few places with red onions, more tomatoes and I even saw a few beautiful eggplants. Not a huge variety of produce but enough for everyday meals.