Induction and duration of tonic immobility in the lemon shark, Negaprion brevirostris

  title={Induction and duration of tonic immobility in the lemon shark, Negaprion brevirostris},
  author={M. Watsky and S. H. Gruber},
  journal={Fish Physiology and Biochemistry},
  • M. Watsky, S. H. Gruber
  • Published 2004
  • Biology, Medicine
  • Fish Physiology and Biochemistry
  • Tonic immobility (TI) is an unlearned behavioral response characterized by a state of immobility and torpor. Effect of inter-trial interval on duration of tonic immobility was assessed in thirty, juvenile lemon sharks (Negaprion brevirostris). Regression analyses showed that massed trials of 12 per session increased the average duration of tonic immobility by 475 sec compared to spaced trials of 1 per session. Each experiment was composed of 24 trials. TI is stable and durations much longer in… CONTINUE READING
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