When leaving Dubrovnik, sea captains were obliged to hand over to the Office of Maritime Affairs the list of crew members. It was also mandatory to list the names of co-owners of the ships. The ownership of the ship was divided into 24 shares (karats). The value of one share was between 100 to 1600 ducats of the Ragusan ducats depending on the age, size, and equipment of the ship. The co-owners of the ship, that had to be identified by the captain of the ship in the Office for Maritime Affairs, were obliged to testify under oath and declare the exact number of shares in their ownership. All this information was recorded in specialized books called Ruoli. Preserved Ruoli books contain data for the period from the mid-18th century to the early 19th century, and only some years of that period are missing.

This series is very important for the research of the maritime affairs of Dubrovnik Jews in the 18th century because the existing data give evidence that almost all Jews were co-owners of Ragusan ships. Therefore, references to many Ragusan Jewish families, such as Ambonetti, Barafael, Campos, Costantini, Conort, Janni, Levi, Levi Mandolfo, Luzzena, Maestro, Pardo, Russi, Terni, Tolentino, Valenzin, Venturra, Vitali can be found in the archival material. The data also show that it was extremely rare that the co-owners of the ships were Jews who did not reside in the Dubrovnik Republic. One of those rare cases refer to a Jew by the name of Danon, from Sarajevo (vol. 1, f. 4). Most Jews owned between one half of the share to 3 shares in one or more ships. Less common are those cases in which Jews owned the half of one ship or more (12 shares) (e.g., vol. 1, f. 81). The data also show that Ragusan Jews very rarely owned the entire ship, which was recorded in the fonds Diversa de Foris (HR-DADU-30).