In the sea one can find a large rectangular tank measuring 20 x 9 metres, carved out of the rough of the actual coast.
Inside this there are six interconnected basins. The seawater was brought in through four channels that were closed by gates once full.
In addition to keeping the fish alive and supplying fresh fish to the population of Baños de la Reina, given their extraordinary surroundings, these pools may also have been used as a swimming pool or water garden for the enjoyment of the owner of the town.
Before the construction of the thermal baths of La Muntanyeta, there were four ponds on the site, which may have been used for salting fish, given the proximity of the salt pans.