I recently enlarged a pond. I drained most of the old one, then built a bigger pond around it. We then cut a hole in the dam and let the water fill in to the bigger pond. Most of the fish didnt survive but a bream did. The water stayed muddy all summer, and with the drought, no water started filling into the pond until this winter. Last week we had a good rain, and I went to see how much water was in the pond. Now the pond is about half full, the water is clear, and all the fish left are dead. You can see several bream laying on the bottom of the pond floor. All sizes - big and small are dead. I dont understand how the water suddenly cleared up when the water is in a clay bottomed pond, nor do I understand why the fish all died just as the new water poured in. I'm a little nervous to stock it in the spring.