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Effect of pH and IONS on motility of scaly carp (Cyprinus carpio) spermatozoa
(2011) Bozkurt, Y.; Ogretmen, F.; Secer, F.S.
This study investigated the effects of environmental factors including pH and cations such as sodium (Na +), potassium (K +), calcium (Ca 2+) and magnesium (Mg 2+) concentrations on sperm motility of scaly carp (Cyprinus carpio). Sperm motility was evaluated by the duration of sperm movement and the initial percentage of motile sperm. The maximum percentage of motile sperm and total duration of sperm motility were observed in solutions containing 25 mM NaCl (95.0±16.0% and 147.0±5.27 s), 0.5 mM KCl (85.0±2.45% and 174±2.47 s), 5 mM CaSO 4 (90.0±2.27% and 95.2±3.46 s) and 10 mM MgSO 4 (80.16±2.45% and 124.56±26.42 s). In addition, maximum and minimum percentages and total durations of motility occurred at pH 8.0 and pH 6.0, respectively. The prolonged duration of movement might be caused by reactivation of sperm or gradual activation of sperm motility. Concentrations more than 50 mM of Na +, 2 mM of K +, 10 mM of Ca 2+, 10 mM of Mg 2+ and more than pH 8 had negative effects on sperm motility. The present study provides us with some basic knowledge about scaly carp spermatozoa biosensitivity to the ionic media.