Ok just read this thread, and I have to add something that may or may not gross some out. Pertaining to the scent part, we were floating the Buffalo the other day and we stopped to do a little relaxing in the water. Well, as I was sitting there I noticed several small minnows would swill up to me and nibble at the hair on my legs. I thought that was kinda weird, but not much thought to it. Well as most people do, I had some dead skin on my feet. So, I started scrapping some off in the water. Them minnows loved it!! I then proceeded to show my wife how the little buggers loved it. I would pick off a tiny piece of skin and let the current take it and boy them minners would attack it. So Im guessing that the salt in the skin was the attractant there?! Oh, I also bit off a finger nail and let it float. They tried to eat it also but dont guess they liked the hardness.