The debate was held as part of the 60th anniversary of the breakthrough from Jasenovac, the Holocaust and the victory over fascism. The authorities of Bosnia's Serb entity are holding a central commemoration in Donja Gradina on Sunday.
Serb Orthodox Church bishop Atanasije said that 60,000 people from the Kozara region were killed at Jasenovac in 1942.
Srboljub Zivanovic, a historian from London, cited German official sources according to which more than 750,000 people were killed at Jasenovac.
He said the genocidal nature had not been uprooted in Croatia despite Croatian politicians' claims that only 70,000 people were killed at Jasenovac.
Slavko Goldstein, president of the Jasenovac Memorial Centre Council, countered by saying that Jasenovac's victims were up to 100,000 -- about 50,000 Serbs, 18,000 Jews, 10,000 Roma, and the rest were antifascist Croats.
He said the truth about Jasenovac was not complete because the issue had been politically manipulated since 1945.
Goldstein also said that during the 1941-5 Independent State of Croatia, Zagreb Archbishop Alojzije Stepinac tried to save people but was inconsistent in his condemnation of the crimes.