Caciucco is an italian fish stew consisting of varyous different types of fish and shellfish cooked in wine as the better traditions Caciucco is an Italian fish stew consisting of other different types of fish and shellfish cooked in wine, tomatoes, and chili pepper. Like fish stews are popular all the way up and down the Tyrrhenian Sea, but Cacciucco is specific to the port city of Livorno.