The Caspian white fish juveniles obtained from semi - artificial reproduction of fish at the Shahid Rajaee Center for Reproduction and Rebuilding Resources of Aquatics in Sari were released into the rivers of Mazandaran province after being caught from the fish ponds and transported by the special juvenile fish transport vehicles. The Caspian white fish juveniles were released in the presence of the general manager of the Babolsar Department of Fisheries, the experts, the representatives of the fishing community and Dr. Afraei, the representative of the Caspian Sea Ecology Research Center. The general manager of the Mazandaran Department of Fisheries pointed out that the Caspian white fish juveniles are released into 31 rivers in this province. He stated: 40 % of these juveniles are released into the rivers located in the east, 30 % in the center and 30 % in the west of Mazandaran province.