Hello I live in Muskegon Mi and there are plenty of wild spotteds in this county. BUt my captive bred spotties are hibernated outside in three diff ponds. One pond is 12 ft by 12 ft and is 48 inches in the middle and 12 inches around most of it. There is about 2 ft of muck on bottom. My other pond is 4 ft by 4ft and 4ft deep. This also is filled with 3 ft of muck. The third pond is preformed kidney shaped pond that is about 24 in ches deep in middle. I hibernate approx 20 spotts in these ponds for the last 13 yrs and have never lost one. In the summer I have lost sight of spotteds just to later find them burined deep in my leaf piles. I keep my females and juvies inside over winter where they lay extra clutch of eggs each year. I can try and send you pics but its easier to give me your email as this site always says mypics are to big to post on here. Ive sent my pics to others on here. BY the way where is China mi? or Fern gulch?