Thermocline in both ponds starting at about 8 feet....my understanding has been that fish will move in and out of the "upper" thermocline area which might explain the sonar readings. If they are on cover moving in and out of the thermocline to 13 feet would certainly be plausible. I was surprised at the minimum readings of 59 and 57 degrees, respectively....should hook up a pump and air condition with that water.
