Who eats whom

Mmm, maybe a poor choice of phrases, but either your prey or predator. Does this aquatic world have room for all parts of the food chain? Stocking again came up in casual conversation "oh those big bad brown are eating those poor defenseless sweet adorable brookies"!

Just an observation made brookies, browns, rainbows and a bass occupying the same pool. Seemed like they all got along just fine. At the C dam I hooked a big bad brown and darn if one of those bully bass chased after it. I am sure he/she was just giving advise on how best to throw that pesky hook.

Maybe it works like nature intended, that the weak are culled out by natural selection and the strong survive? Can you imagine introducing a true predator like a bluefish or striped bass or a northern pike via multiple fish passages into the river. Once they exhausted the food supply they would leave and life would continue just less a few brookies, browns and rainbows. Except for those that learn to adapt.

Speaking of adaptation, maybe the bird population ( those pesky fish eating ones of course) need to be culled. Oh, that's right the DEC has decided that swans are a problem, what's next osprey?
Gets you thinking what's really wrong here?