I got the impression that the fish thinks that your fingers are vegetation. When you're in the right position, you can grab the gills and tail at the same time and throw it onto the shore where a helper can dispatch it.
- If you can get your hands on the fish's belly for a whole minute, why not just grab it then and there?
- How did evolution let something like this happen? What happens if the fish swims near the bottom of the stream for a bit and happens to touch it's belly?
If I read this correctly it would not have reacted as violently to me grabbing it if I had tickled it beforehand and I might have had an amazing trout dinner with an epic fishing tale to go with it.
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