Winter is a difficult season for Koi care. Use the following tips to help your Koi make it through the frozen months.
1. Keep your pond clean
This one is a no brainer. Leaves, sticks and even garbage can end up in your pond during the Fall. Leaving them in the pond through the winter will cause the DOC (dissolves organic compound) levels in the water to rise. Clumps of leaves and debris also provide the perfect environment for anaerobic bacteria. Anaerobic bacteria release hydrogen sulfide into the water, which is poisonous to your fish.
Scoop any refuse that ends up in your pond in the Fall before the temperatures drop.