one other thought, if the trout have gone into the depths and are somewhat inactive(not feeding), the minnows continue to spawn and increase in #, with no predation from the trout. So the food increases in # with no risk from the trout to them. We just have too much food avail and they don't have to bite. We did put #100 5-7" rainbows in the spring and have seen their activity, just not the older,larger trout. Haven't seen the blue gill spawning like previous years in the shallows. Like i mentioned be4 we had a tremendous # of tadpoles this spring and of course that adds to the food chain. Hopefully, we start to see more activity as the water cools in the fall.
