Guys you gotta try this. I quit trying to keep threadfin shad/blueback herring alive since Im going to cut them before I put them on the hook anyway. To keep them firm and fresh I use one of these portable vacuum sealers on the market now. Once out the bait store, I put a dozen in each bag, hit em with the ole portable battery operated hand held held vacuum pump and pile em up in the cooler. I dont try to freeze them, but it sure works good to keep bait fersh and firm for those one or two day trips. The little hand held pump and re-usable vacuum bags can be bought at Wal-mart for around 20 bucks.