Since its inception, the material used in the Baltic sturgeon restoration program has been, and continues to be, hatch and fry of this species imported to Poland from Canada. Heavy fry was used to create a stock of selects that are cultured under different conditions. In 2011, signs of maturation were noted among some selects cultured in tanks in a recirculating aquaculture system. After conducting biopsies, two males were chosen for hormonal stimulation, after which milt was collected from them. The body weight growth of these males was analyzed in comparison with the mean body weights of other select stocks, and the mean growth rates of the selects was very high at 42% annually. Sperm was collected twice. The milt obtained was characterized by high sperm motility (above 70%) and a relatively low concentration (0.735 mld/ml). The milt from the first collection was thickened with the centrifugation method, and that of the second was cryopreserved in liquid nitrogen vapor. The motility of the sperm following cryopreservation and then thawing was high (65.4% from the first collection and following centrifugation and 64.9% from the second collection).
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