Alligator snappers are listed as a threatened species and will probably make the endangered species list soon, as opposed to the common snapping turtle, which is a dime a dozen, so to speak. Many folks confuse the common snapper with the alligator snapper. They think any large snapping turtle is an alligator snapper. Stories about giant man eating turtles abound and are often perpetuated by people in areas where these giants never lived in the first place. /forums/images/graemlins/laugh.gif
Alligator snappers range doesn't extend much further north than southern Illinois, Indiana and Ohio. 10-15 pound common snappers are just that... common. 20-30 pounders are getting harder to find each year due primarily to overharvest and habitat loss. And large alligator snappers in the 100+ pound range are few and far between.
I've had turtles raid my stringer before, so I switched to a live basket or just throw them right in a cooler and skip the turtle feeding, altogether. It isn't too hard to outwit the turtle. Poultry farmers that raise ducks and geese have legitimate concerns about snappers and they can decimate the young birds quickly. There is little that can be done to keep them out, so harvesting the turtles is the best solution. As for fish farmers, I haven't heard of turtles being a problem, but I would think they would just harvest the turtles and eat or sell the meat. Killing them just because we don't like them and not using the meat seems like an awful waste of a resource. There are turtle trappers around here that offer their services for free so long as they get to keep the meat. They use traps that are highly affective on turtles and the meat isn't wasted. I'd suggest going that route if anybody wants to rid their property of turtles they don't like, rather than just shooting them and letting them sink to the bottom. /forums/images/graemlins/frown.gif
There was an excellent article in National Geographic on snapping turtles in the March, 1999 Edition. I think it was titled Swamp Thing.