Application of Computer‐assisted Sperm Analysis in Selecting the Suitable Solution for Common Carp, Cyprinus carpio L., Sperm Motility

The common carp, Cyprinus carpio L., sperm motility parameters were analyzed by using computer‐assisted sperm analysis system. The percentage of motile sperm ( MOT , %), progressively motile sperm ( PRG , %), curvilinear velocity ( VCL , µm/sec), average path velocity ( VAP , µm/sec), the wobbling index ( WOB , %), movement linearity ( LIN , %), beat cross frequency ( BCF , Hz), and amplitude of lateral head displacement ( ALH , µm) were determined. Five activation solutions (As) were used to activate sperm movement. As 1 solution: 68 mM NaCl , 50 mM urea, 0.5% bovine serum albumin ( BSA ), pH : 7.7, 181 mOsm /kg; As 2 buffer: 100 mM NaCl , 10 mM Tris, 0.5% BSA , pH : 9.0, 199 mOsm /kg; As 3 solution: 86 mM NaCl , 0.5% BSA , pH : 7.4, 167 mOsm /kg; As 4 buffer: 5 mM KCl , 45 mM NaCl , 30 mM Tris, 0.5%, pH : 8.0, 160 mOsm /kg; and As 5 solution: distilled water with the addition of 0.5% BSA , pH : 7.3, <3 mOsm /kg. Among five tested solutions, a buffer with a pH of 9.0 and osmolality of approximately 200 mOsm /kg (As 2) was the most suitable. After its activation, a significant increase in MOT and ALH values was observed, which can be of importance to the effectiveness of egg fertilization .