Rake out fallen leaves or shake off those that have gathered on protective netting.
You may wish to make your pond more wildlife-friendly. Our Wildlife Garden section below features seasonal advice in this area.
This may also be a good time to repair any leaks in your pond.
Troubleshooting
Continue to watch out for herons stealing fish from your pond. The only way to discourage them is to net your pond, as explained last month.
Use pond heaters to keep ponds from freezing over, as this can be fatal for fish and other pond life. There are other precautions you can take to prevent your pond freezing over, if you do not have a heater. To make a hole in frozen ponds, hold a saucepan of hot water on the surface until melted through. Do not crack the ice, as this is harmful to fish.