Interesting observations yesterday

I went to a mid-sized MI river yesterday, low water, clear, sunny day.  I started at an old auto bridge that has been converted to a pedestrian walk, and it's quite high over the river allowing good viewing of a lot of water.  I started with a white 3.8 Keitech swimbait, and immediately noticed that a smallie was spooked instantly on seeing it.  The cast was well out, so he didn't get spooked by the lure hitting the water.  He was obviously spooked by seeing the lure. So I changed to a shallow crank, and next time it went by a bass, same thing.

I changed to a very small, about 2.5 inch tube on a ned jig and had a small fish chase it.

I moved to a country area of the same river where I have fished since a kid with my dad.  Scattered good-sized rocks, depth mostly about 1-3 feet.  I took 3 small bass in the first few minutes on the tube, with the fish aggressively going after it.  

I then switched to my fly rod and waded for a while.  There were so many long weeds coming down with the current that it was very hard to fish, but I tried a shrimpy-looking tan fly first , and had no takers. I switched to a purple maribou streamer with lots of sparkle on the lower half of it, and immediately took a few small fish. 

I never got into a fish over about 12 inches, but it was obvious that some lures actually spooked them, and others were attacked aggressively.  Interesting contrast of their reaction to different lures.