Its a form of Tonic Immobility, or animal hypnosis https://simple.wikipedia.org/wiki/Tonic_immobility https://simple.wikipedia.org/wiki/Tonic_immobility There'

Its a form of Tonic Immobility, or animal hypnosis https://simple.wikipedia.org/wiki/Tonic_immobility https://simple.wikipedia.org/wiki/Tonic_immobility There's even an entry on Trout tickling on the page. What quite impressive is putting bigger sharks into the tonic state. Here's a pretty crazy clip from the Sharkman doco where he puts a feeding Tiger shark into tonic https://www.youtube.com/watch?v=D0HnUvXMH7w https://www.youtube.com/watch?v=D0HnUvXMH7w