Socialist Federal Republic of Yugoslavia
Regarding rivers, the Danube was navigable throughout its entire course in Yugoslavia, linking the ports of Belgrade, Novi Sad, and Vukovar with Central Europe and the Black sea. Long stretches of rivers Sava, Drava and Tisza were also navigable.
Kladovo
Though the river Danube is very polluted by international standards, many people still fish in it. Before the power plant was built, sturgeon caviar from this area was very popular and was exported as a delicacy to the western Europe and the United States. In the 1960s, up to 3 tons of caviar yearly was exported from Kladovo. Record catch from that period is a heavy sturgeon with of the roe in it. However, the records from the past, dated in 1793, report of the sturgeon which had . The specificity of the Kladovo's caviar was that the roe gets "ripe" enough during the long journey of the fish from the Black Sea upstream the Danube. Also, roe was turned into the caviar using the dry method.