The question has been understood. Gar intake food, use the energy that they can from it, and excrete the rest of the material as waste, through the normal process of digestion.
I would disagree with most saying variant two. In keeping of Florida & LNG, I have yet to EVER see one poop. I am sure that they must sometime, but I have never witnessed it. I can not say the same for ANY of my cichlids that I have kept. I'd go as far as to say that the Nile Tilapia fry that I bought this January (1 - 2" range) that are now all over 1' long have no turd cutter as they always seem to have a poo trail twice the length of their body attached to their anus.