Abstract
The Siberian sturgeon, Acipenser baerii Brandt, is reported in the Reda River, which flows into the Puck Bay, for the first time. In total, 12 specimens of A. baerii were caught during monthly surveys in June and July 2006. The fish were captured during downstream movement between 18:00 and 06:00. The specimens collected in Reda River ranged from 10.3 to 15.5 cm standard length (SL). It is hypothesized that the fish originated from one of the hatcheries located on the banks of the Reda River. This is also the first report of Siberian sturgeon in Polish Pomeranian rivers.