Are you talking about Helm's Bend? If so that is way down river and post Dam repair not a big trout harboring area it once was years ago.
I fish a lot at night on the Caney and sure your chances of catching bigger fish go way up unless fishing highwater during daytime. Its a comfort thing along with a species trait of browns. They become mostly nocturnal after a certain point in their growth. It is usually follows closely to when they make the change over to a high protien meat majority diet. Sure a 28" brown will still snack on bugs just as you might still snack on skittles but its the steak dinner that fills you up.
Rainbows are a little more bug related even when they get bigger. They don't totally leave that niche like the browns do and for some reason I have hard time catching many during night hours.
I would say that maybe that size rainbow at night in shallows would have been due to the time frame we are in. He may have been up looking for something that naturally happens in the fall with the Brown's. I could be totally wrong but just my opinion.
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