Induction and duration of tonic immobility in the lemon shark,Negaprion brevirostris |
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| Authors: | Mitchell A Watsky Samuel H Gruber |
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| Institution: | (1) Biology and Living Resources, Rosenstiel School of Marine and Atmospheric Science, 4600 Rickenbacker Causeway, Miami, FL 33149, USA;(2) Present address: Dept. of Physiology and Biophysics, Mayo Foundation, Rochester, MN 55905, USA |
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| Abstract: | 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 the lemon shark than for other sharks. These findings have enabled us to develop a quantitative bioassay for use
in testing chemical shark repellents. |
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| Keywords: | behavior bioassay elasmobranch Negaprion shark and shark repellent |
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