The best thing to do, is to check the stomach contents of a large fish, or alternatively check the larger food sources that inhabit the location where you fish.
large trout do eat small insects, but for best results, you will need to concentrate on the larger food sources, like frogs, crabs, larger snails, even larger terrestrials like mice, lizards, and larger locusts. It's no secret that large trout do feed differently, and will predate on the above, rather than expend a lot of energy on tiny insects. (this is a generalisation).
The problem when fishing these larger immitative food sources, is to know how the natural behaves, and fish it accordingly. It's also important to know where the big fish hang out in your stillwater, if you want to target them specifically. If you fish the standard flies that you would normally do, you will sometimes pick up the larger fish, but this would be more by luck than design, but to increase your chances of catching them consistently, you will have to change your fishing tactics.
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