Based on the observation of the carp sperm swin,a study of the effect of sodium salt solution of DNA mac molecules (about 100 kb) and ultrasonic fractured DNA fragments (about 6 kb) on its activity was made.The result showed that the survival time of the carp sperm in DNA fragments solution decreased gradually as the DNA concentration increased under the condition of the same sodium salt solution.When DNA concentration was 50 μg/mL,the sperm survived up to 20 min,the longest survival time.When in the sodium salt solution of DNA macro molecules...