In answer to Newman's question -
We're not sure. I'll have to do a little research.
Didn't think he'd live that long.
He does make me think of dinner when I clean his bowl.
True story - BullCat Jr. picked out a crayfish with no front legs/claws.
I tried to talk her out of it. The lady in the store tried to talk her out of it. No doing. She told us that the legs would grow back.
Three or 4 days later she calls me and shows me his new legs with claws. Shows the power of positive thinking.