Designed by architect Pietro Ghinelli in 1834. Built in neoclassical style with 24 doric style columns which compose an arcade. The whole structure is made of bricks. Until a few years ago, the buying and selling of fish took place under the portico on a daily basis. In the central square still today, in the morning, the itinerant merchants of fruit and vegetables carry out their activity.
The Ercolani Arcades are one of the urban elements that most characterize the city. Their name is reminiscent of Monsignor Giuseppe Maria Ercolani who designed them in neoclassical style in the mid-eighteenth century on commission of Pope Benedict XIV. They run along the entire right side of the Misa river which flows near the historic center, extending into 126 Istrian stone arches.