I have a little trouble with the "fear chemical" theory. I'm not saying fish don't give off those chemicals, but I can't imagine it's a big factor in itself. The reason I think that is because of my experience fishing Mr. H's big pond for the last few months. I would say that on average I hear and/or see fish preying on each other about every 15 minutes, and that's just the ones that make noise. Wouldn't the prey fish constantly give off similar chemicals? Just recently I was landing a 6 inch LMB when a 3 - 4 lb LMB tried to take it. I suppose it all depends.
