A Computer Assisted Sperm Analysis system, CASA, enables determination of numerous parameters characterizing sperm motion activity. This system allows for the examination of the effect of various environmental factors on spermatozoa motility parameters. The aim of this work was to compare time-dependent motility changes of sperm obtained from the dace, Leuciscus leuciscus (L.), by abdominal massage (sperm from spermatic ducts) and directly from gonads (testicular sperm). The analysis concerned such sperm motility parameters as: percentage of motile sperm (MOT, %), total sperm velocity (VAP, μm s–1), straight line velocity (VSL, μm s–1), curvilinear velocity (VCL, μm s–1), linearity (LIN: VSL/VCL · 100%), straightness (STR: VSL/VAP · 100%), amplitude of the lateral head displacement (ALH, μm) and beat cross frequency (BCF, Hz). During 105 seconds of motility, no significant differences were found in the values of MOT between sperm originating from the spermatic ducts and from the testicles. Changes in MOT were only observed during seconds 120–135 of movement, when significantly higher values were found for testicular milt. Significant higher sperm velocities (VAP, VCL, VSL) at the 15s from activation were observed in the sperm originated from spermatic duct. On the other hand 120s after activation of movement, values of sperm velocity (VAP and VCL) of milt originating from spermatic duct significantly decreased in comparison to testicular milt. Our data showed that sperm obtained from spermatic duct have initially higher sperm motility speed compared to that obtained directly from the testis. However testicular sperm are able to swim longer than sperm obtained from spermatic duct.