I could write a book about this...Oh, I did
Go to my website and read the hibernation article by Dr. Roger Klingenberg, or read the chapter about hibernationin in my online book, or buy the paperback book. It has a large section on refrigerator hibernation.
The same process a person undertakes for outdoor hibernation is done for refridgerator hibernation. Don't hibernate sickly, weak or thin turtles. Stop feeding the turtle two weeks before hibernation, and do lots of soakings to clear the gut and hydrate the turtle.
The pitfalls of this kind of hibernation are fridges that don't maintain the proper or steady temp (around 45 degree), poor humidity in the hibernation box itself, low oxygen in the fridge and too long a hibernation period. I always recommend a person do a trial run with the fridge for a month BEFORE putting a turtle in it. This way you can check temps and see how well the box your choose holds humidity. A 6 or 8 weeks hibernation in the fridge is long enough in my opinion to set the biological clock so hormone levels are normalized. Longer and more risks could come into play unless you are an old hand at it.
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Tess Cook
www.boxturtlesite.info