Abstract
The sperm motility of fish reflects their fertilizing ability. Sperm activation in fish with external fertilization occurs in an isotonic medium (sea or freshwater). The duration of sperm motility is a compromise between the level of energy reserves possessed by the sperm and the process of osmotic damage it experiences in the activating medium. Under natural conditions, various biotic and abiotic factors can affect the characteristics of motility. At the same time, when assessing the reproductive potential of males in laboratory conditions, the dilution and methods of its activation have a significant effect on the characteristics of sperm quality (namely, speed, the proportion of motile spermatozoa, and the time of their activity). In our work, we determined the main characteristics of the motility of the Black Sea turbot sperm at a dilution of 1:10 and 1: 100 with seawater. We have shown that, the average speed and percentage of motile sperm significantly decrease with higher dilution of seawater.
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