Bass and sunfish take to pellets prett quick, especially when they see other fish eating it. When I was a kid, I had some that I caught and put into my 125 gallon tank with my oscars. After a few days of seeing the other fish fighting for the pellets, they joined right in.
The interesting thing about that is each successive generation gets easier to feed train at hatcheries. I actually have a 20 year old text that says bass and yellow perch are impossible to feed train. That's definitely not the case anymore.
I was able to feed train 50 percent of the hybrid crappies a friend brought me from a hatchery in Arkansas. The hatchery claimed they tried and were not successful. That said I believe once planted into the pond they reverted back to wild feed which they are noted for. I haven't seen any sign of them at feeding time.
I'm hoping in the next few years I can produce my own hybrids with local stock and have better success. If I can feed train them at a small enough size I believe I can have close to 100 percent success. The ones from Arkansas were a little big for feed training.
Speaking of hybrids just got this close to 4 lb. 19 inch hybrid crappie in from a lake in Kosciusko County, Indiana. It was a really thick fish. Probably due to the gizzard shad in the lake. I mounted it for another taxidermist for a flat rate and he will finish it. As you can see it needs to be painted to match the original coloration.
Here is the original picture and then the fish after it dried. Note you can see a faint bar pattern in the fish after it dried.
It had 7 dorsal spines and 6 anal spines.