Oh Koi

Now that it is getting cooler at night I am starting to wonder how much longer we can keep the fish out in the pond? When we moved in August we also became the proud owners of 5 large koi fish that reside in the pond in the back yard. So the picture below is not our waterfall and pond since I was too lazy to go out and take a picture this morning but you get the idea of how shallow the water is and how big the fish are. We have been unsuccessfully trying to pawn these fish off on anyone who will take them (we would gladly offer up the indoor pond, food, and all accessories to the kind soul who gives them a new home!) but now that the cool weather is fast approaching I am starting to get worried about how much cool weather they can take. If you know anything about caring for fish PLEASE help us out!