Like Cmj I've frequently experienced that while winter crappie fishing. I use a couple of techniques to get them to not remain on the surface and have no clue whether they eventually survive or not.
The first method is to smartly spear them nose first into the water so they go a foot or so deep where they usually will start swimming away and down. On this method some say to first close their mouth before spearing them into the water but I've found it doesn't seem to make much difference. If after a couple of attempts this way and they remain on the surface I'll then use my second method which tends to sounds like a contraindication if one is really trying to help the fish survive.
That second method is to very smartly throw or smack them sideways onto the surface of the water like you would smack your open palm onto the water for maximum splash effects. Again I can't say whether they eventually survive but have seen them swim away and not remain floating on the surface.
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