I live in Nebraska and was fishing a 25 acre sand pit lake. It's deepest point is around 17 feet. The weather here is starting to warm up. A few 40's and 50's lately. We had a 65 degree day Saturday so I went out fishing. It was extremely windy. The water surface temp was 47. The only fish I saw on the finder were in 15 feet of water, suspended 2 or 3 feet below the surface. There were no fish in 12 feet of water or shallower. Is this normal? I was drifting a minnow on a bobber and throwing a spinnerbait. Clarity was probably about 3 feet. Just want someone to explain to me what fish these were and what they were doing. Thanks in advance!