Originally Posted by Chachi
Hi Folks, I inherited a pond with 10 fish this summer ( one big koi and 9 big goldfish) and was worried about how to winter them over so I bought a big tank and brought most of the pond water and fish into my living room.
Now I'm learning about ammonia and nitrates and getting a little worried. The fish seem ok but the water is not very clear.
Unless the whole pond freezes solid, you can overwinter Koi and goldfish in the pond. In fact, most Goldfish prepare for spawning once there is ice over their heads. The spring thaw spurs them to spawn.
Since you don;t use exact sizes for either the fish or the tank, you may be doing more harm than good by having them in the tank. Would need more specifics to say "yay" or "nay"
. You may also be able to use a "thermal blanket" over the pond during the peak cold months if it would make you more at ease. This can be done with some framework and thick plastic to form a greenhouse type effect to save you from the work involved in keeping large goldfish in an aquarium. Many fish farmers use this methods on their ponds.
Just some food for thought. Hope this helps