Reizphysiologische Untersuchungen an Cercarien von Diplostomum spathaceum

  title={Reizphysiologische Untersuchungen an Cercarien von Diplostomum spathaceum},
  author={Wilfried Haas},
  journal={Zeitschrift f{\"u}r vergleichende Physiologie},
1. The cercaria of Diplostomum spathaceum (Rudolphi, 1819) shows 2 phases in its swimming behaviour: A period of sinking lasting between 2 and 120 sec (passive phase) alternates with a rapid active swimming motion (active phase), usually in an upward direction, of between 1/10 and 3 sec, and in length usually between 2 and 8 mm, with a maximum of 16 mm. Both phases were quantitatively registered by measuring the duration of sinking, t (passive phase) and the length of the active swimming motion… CONTINUE READING