Fig. 3. Swimming velocity, beat frequency and wave form of FWT and SWT sperm. (A) Swimming velocity, (B) beat frequency and (C) waveform of FWT and SWT sperm in hypotonic (50 mmol l^-1 NaCl) and hypertonic (300 mmol l^-1 NaCl) conditions with or without Ca²⁺. Values are means ± S.D. (N=4). ND, not determined. ^*The velocity of FWT and SWT sperm in the hypotonic condition+Ca²⁺ (A) were significantly different, and of SWT sperm in hypotonic+Ca²⁺ and hypertonic solutions (P<0.01).