redearslider.com

My pond is about an acre and slowly my turtles have all gone. There used to be at least twenty.. It's taken about three years for them all to disappear but I've seen no slider in months as the very last one seemed to disappear around that time.

They were all wild and not friendly but i still miss them

Any ideas?

Could be a lot of factors. Climate change, water quality or contamination, food supply, wild animals.

Listen97 brings up all good points. Don't forget about poachers too, though it's not as likely as the other reasons.