Secondi piatti just a few examples: Frutti di mare in guazzetto, a soup served with toasted bread, infinite variants in different regions.
Gratin di frutti di mare
Pepata or Impepata di cozze e vongole, mussels and clams with garlic, parsley, and olive oil, from Napoli
Cacciucco livornese, a rich and spicy fish and shells soup, with red (yes, red) wine and tomatoes sauce, served with (unsalted) garlic bread, from Livorno, Tuscany
Muscoli ripieni, from La Spezia (Liguria) mussels stuffed with a mix of bread crumbs, eggs, mortadella (believe it or not), parmigiano, and herbs.