Several Soviet tugs active on the Danube according to a CIA report dated 1 July 1948

An item reported that there were 11 Soviet tugs available on the Danube, Romania of which six were diesel propelled with a horsepower varying between 750-800hp, 4 of each 1.200hp while the Odessa had a horsepower of even 1.500hp.

Source
The report was published on www.archive.org, document number CIA-RDP82-00457R001600650003-4