Like yes, but, the actual hard part of aquarium fish keeping isn’t really related to the fish themselves. It’s the water… nature has already prepared this biologically active, clean, ample supply of water for the air dropped trout. Replicating that in a tiny glass box without at least a surface understanding of the chemistry involved can be very difficult. But you should also learn how to supply an animal with the proper environment before you get one.

I think one major difference is feathers - we have not had feathers show up in any mammalian mutations or evolutions that I know of. We went a different direction, with the fur and all. So even if fast tracking wings were possible I think that would involve some kind of fur covering and different adaptation for flight more akin to bats.

Another major hiccup is - fast tracked uncontrolled evolution, aka genetic mutation, without the controls/failsafes (such as non-viable mutated animals dying out and failing to breed) just equates to cancer…

We mammals are pretty far (~65 million years) diverged from birds, so you’d probably be looking at more of a bat style wing or flying squirrel gliding skin mechanism than anything feathered.