Are you using the statisitcal "significant" or the general concept? Most people have no idea of what statistical significants is. Compared to overall mortality the variance may well not be "significant" but I will contiuue to go barbless. I know that the fish are easier to release and thus must do better. I also know that the hook goes in easier making hooking easier. I also know it comes out of me easier and that is a very "significant" factor.