A couple years ago we had a flood and the overflow pipe got covered with a turtle, raised the pond level a whole foot! Also I was astounded to see a 3 ft. wide river of small bluegill over 100 ft long at over 100 bluegill per sq. ft. washed over the dam from the flood. The 30,000 bluegills that washed over didn't dent the population much, which seems that it is impossible to overfish bluegill. Kevin