Out of 130 the percentage is adding up. That's only the ones I know about. I'm sure there is more. This heron stands over 5 foot. It's huge. I was wondering if maybe the water temps were affecting the trouts ability to escape.
They're more naive then other species of fish. Basically domesticated and not alarmed by a looming large shape above them as they associate that with getting fed.
The sooner you get the staked lines in tbe better. Should take you a couple of hours tops.