I used to live in a house where the landlord had a well full of rainbow trouts. I asked for permission to catch a few for dinner. He said ok. So, I put a food ball on a hook, lowered it down and one bit the bait.
After that, no other fish would bite any more bait.
But two years ago, I went to a southern MN lake and caught one after another from the same bank.
Not sure what to think of farm-raised fishes.