tcBob... imagine a harpoon gun/harpoon on a much more primitive level. Many bows can be set up to have a reel/line mounted to the riser (handle). The line is connected to a fiberglass arrow with a barbed arrowhead (so it won't pull out). You see the fish up shallow... and fire the harpoon/arrow... and reel 'em in. Spring carp seasons are big-time events in many areas. Other popular targets are buffalo and gar... some of which get very big and very mean.
Hope that helps.