I use to go out on simcoe in May and drive around till I saw the splashing on the surface
most times it was bass pushing the smelt into a ball near the surface and eating till they puked
many many many times I saw bass floating on the surface, I would grab them , they wouls be stuffed with smelt the couldn't breath smelt sticking out of their mouth and their gills..
I would remove 10 or so smelt just so they could breath then I would hold it in the water till it could swim on it's own...stupid stupid bass.......