Feeding your pond fish during the winter depends largely on just how cold it gets in your area. When the temperature drops, do your fish make their way to the bottom of the pond and remain there, motionless, for long periods of time? This is generally a sign that they are hibernating and conserving energy, which means they need less food than usual. If they are swimming around actively, they’ll generally still require sustenance. Let the temperatures and the activity level of your pond fish determine how much you feed them during the winter months.
7 Some pond experts advocate that you stop feeding your fish altogether during the cold winter months. Others insist that doing so can affect the health of your fish when temperatures begin returning to normal. In general, it's a good idea to adjust your feeding practices based on the activity levels of your fish, but always keep in mind that no matter how active they are, their digestive process will be slowed by colder water temperatures, so avoid overfeeding.
Opt for food that contains protein and is highly digestible if you are going to continue feeding during the winter. This is important all year long, of course, but particularly so during stretches of cold weather, when your pond fish are less active than usual.