The fish don't seem to be under weight. I had a "Fisheries" Grad out today to look at the pond. She thought it could be a combination of over-population a water turn-over. The over population I can understand. I've never really removed any fish from the pond to speak of, and I know that is not good. I saw several young bass swimming around today, and they seem to be OK. Also, I've not seen a dead bass or catfish. I'm going to check out the links everyone has provided and try to spend some more time checking things out tomorrow. I'll try to collect a bunch of the dead BG and take some photos. I have a feeling that my problem my be too many fish in too small a pond and spring water turn-over. Does that seem reasonable? Thanks.