Half of my fish are Characins - they'll only eat live foods. Mollies are a buck a piece, @ 50-100 feeders weekly( depends on health and size of feeders ) - it'd be completely unaffordable. I have 2x10 gal and 2x30 gal feeder tanks. (hate runnin' to the pet store 1 or 2 x weekly) I prefer comets cause of their cold water compatabilties - to increase their nutrional value I feed them Hikari micro pellets, crumbled up massivore, and supirulina flake - my juvie rhom eats 3 small comets daily with the addition of a small chunk of either shrimp, pollack, and talapia. The RBP might eat 3 a month, prefers the prepared foods but enjoys the excersise from time to time of catching live fish.
There is NO way in hell - I'd ever thro fish from the river in any of my tanks. Wild caught fish generally always carry some form of parasite. Maybe once or twice a year the feeders might bring ick to the tanks - dose of cletted cooper- gone 2-3 days max. But every wild caught fish I've ever bought always come with flukes or worse.
I'd think twice about thoose Pike and Pickeral. Also fish cannot digest Fats that are contained in land mammals, it stays with them evertually killing them- so pinkies very bad idea as well.
If your P's are eatin' pellets (mine won't even consider a pellet) WHY change? It's probably the best nutrition you could feed a fish.