A wooden plank and brick tank containing about 300 oyster shells, dating to the first century and interpreted as an "ostriarium" intended for keeping the shellfish alive before their consumption, probably in an adjacent villa, has been discovered in the waters of the Venice lagoon. The discovery was made during underwater investigations conducted by Ca' Foscari University. Around this discovery, the exhibition "A Roman Ostriarium in the Lagoon of Venice" will be staged from April 16 to November 2 at the Museum of Natural History. Part of the findings will be on display, with artifacts, images and videos of underwater excavation operations and research activities, and a three-dimensional model of the lagoon archaeological site. The display provides additional information about the inhabitants of the Venetian lagoon before Venice, in Roman imperial times. In contact with the vivarium are brick foundations supported by a forest of oak poles that must have belonged to a rather important building constructed in the same period. Hundreds of fresco fragments, mosaic tiles, and some fine marble slabs make the building interpreted as a possible luxury villa. Among the most important finds was also a precious gem that must have adorned the setting of a ring of a very wealthy person who was a frequent visitor to the ostriarium.