When I was a little kid around 7 or 8 years old we kept one from the time it was literally about an inch long to I guess around 14-15". When it was a baby we'd go and catch guppies in a special net we made out of a screen door and then when it grew we'd feed it worms, crickets, and other small fish. In the end we had been feeding it small bream we'd catch but a couple times my dad got lazy and went to the baitshop and got shiners, well, long story short the poor guy died of ich. RIP my largemouth friend, it was definitely a great experience growing up.