CJB the first catch would scare all the fish but the next day they were all feeding again. The fish I think that is the smartest is the White Amur grass carp. When I tried to spear one, the GC would just disappear for the rest of the summer. The next year fewer would feed again, and again after trying to spear one they would not come back. It was like they could communicate that it was dangerous to feed. I actually speared two and both got away. Both times they were so heavy and strong they pulled the spear out of my hand and I later recovered the spear on the bottom of the pond. The winter kill finally did kill all but one of the 18 GC I had. I saw him early last spring but not since.