Once caught a 5# bass that "sipped" a #14 popper and have caught largemouth and spotted bass (Kentucky Bass) on #18 nymphs...
Had an old friend, who said that in the 50's, he and his buddy would catch bass in the 100 degree heat of the summer in north Louisiana bayous by casting #18 dries/midges into the shadows of the still waters and then just wait... sometime 2-4 minutes without moving the fly. Large, largemouth bass would slowly swim to the surface and sip the midge flies...
Yeah, bass eat whats in their waters...