It was nothing to catch 80-100 brook trout in half a day. They were not all guppies either.
upstream....I could not move my feet and catch 30 here
Fast forward a dozen years the same hole as top photo. The stream has warmed 4 degrees and browns have moved in.
The stream is pastured heavily these days and you can't buy 10 brookies in a day. No gill lice as of yet.