The aim of the study was to examine sperm maturation in sturgeon and to establish the localization of the maturation. We demonstrated that sperm maturation occurs in sturgeon outside the testes via dilution of sperm by urine. The process involves the participation of high molecular weight (>10kDa) substances and calcium ions.

Faculty of Fisheries and Protection of Waters University of South Bohemia in Ceske Budejovice South Bohemian Research Center of Aquaculture and Biodiversity of Hydrocenoses Zatisi 728 2 38925 Vodnany Czech Republic

Faculty of Fisheries and Protection of Waters University of South Bohemia in Ceske Budejovice South Bohemian Research Center of Aquaculture and Biodiversity of Hydrocenoses Zatisi 728 2 38925 Vodnany Czech Republic; Institute of Biology 5 N Karazin Kharkiv National University Kharkiv Ukraine

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