Last week while looking for signs of Yuki's demise, we spotted the big snapping turtle just outside the fence on the north side of the pond. I didn't see any way it could get to the inside. But today I was raking floating algae gunk out of the south end of the pond and in the shallows was a large snapping turtle. I spotted the shell as I lifted out some gunk. The shell wandered down the sloping ledge to deeper water. So either there is 1 adult snapper and it has a secret passage under the fence or there are two adults, one on each side of the fence.
Well now I have a conundrum. I rescued the two fish from certain death in the mud hole, kept them in the bucket in the house all winter. If I put them back in the pond at their current size I suspect they may become turtle food.