Catfishpena, the only way that I know of to keep the gars from getting your bait is to fish where they ain't. Otherwise, you just have to put up with them. Using a bait that they don't care for could help, but they like the same things catfish like. And that includes shallow water coves, creeks and spillways. A place like you're fishing concenrates fish and that's good, but the gars will be concentrated also.
You can be sure by placing the toe of a pair of pantyhose over the bait. The needle teeth will hang in the nylon mesh. They are kind of fun to catch, better than nothing I guess. I know there are people that advocate releasing them but around here folks hate them so much, they throw them back up on the bank for **** feed. They ain't nothing but a big nusiance.
If they ain't too big, they will move out if the big cats move in. Big catfish will eat them, I've found them in their bellies.