greenteal wrote:
At first I thought they were some winged moths but when I washed all the stomach contents in water there were all leaves. No other evidence of insects or aquatic animals.
Some morsels can be mighty small, anything Daphnia or Copepod size can be washed out or overlooked very easily. Not saying you did this, but there's a lot of micro size forage in detritus and it might have been more efficient to just gobble it in leaves and all.
Not sure how a trouts digestive system does with such approaches to feeding, but large goldfish I had years ago could devour mealworms, then later purge themselves of the inedible/undigestible exo material. They'd crap some out, but most of it was hocked out after eating a bunch of 'em.
Perhaps trout can do something like that. Or they're just plain stupid.