Scroll Down If you want a quick Explanation of Tonic and why it affects animals.
Longer Video Of Shark Tonic – From Discovery Channel
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Part 2 – Longer Video Of Shark Tonic – From Discovery Channel
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From WikiPedia – Tonic Immobility or Apparent Death
Tonic immobility is a natural state of paralysis that animals enter, in most cases when presented with a threat. Some scientists relate it to mating in certain animals like the shark.
Some sharks can be placed in a tonic immobility state by turning them upside down. The shark remains in this state of paralysis for an average of fifteen minutes before it recovers. Scientists have exploited this phenomenon to study shark behaviour. Usually when testing sharks under this "tonic" state, scientists will put a chemical plume in the water awakening the shark.
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