This study reported facultative parthenogenetic cleavage development of sterlet sturgeon Acipenser ruthenus eggs and quantified the percentage of parthenogenetically developed eggs in relation to the fertilization ability of different females. When eggs were activated in freshwater, 5.1-13.7% of eggs developed parthenogenetically, while among those activated eggs 3.6-9.4% developed to 2 cells, 0.4-4.5% developed to 4 cells, and 0-0.8% developed to 8 cells. The mean percentage of fertilized and parthenogenetically activated eggs among the females was negatively correlated (R(2)=0.71, p=0.036), which indicates that parthenogenetic activation rate of sterlet eggs depends on the quality of eggs in terms of fertilization rate.

DTU Aqua National Institute of Aquatic Resources Section for Marine Ecology and Oceanography Technical University of Denmark Charlottenlund Slot Jægersborg Allé 1 2920 Charlottenlund Denmark

University of South Bohemia in Ceske Budejovice Faculty of Fisheries and Protection of Waters South Bohemian Research Center of Aquaculture and Biodiversity of Hydrocenoses Research Institute of Fish Culture and Hydrobiology Zátiší 728 2 389 25 Vodňany Czech Republic

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