Where are you? Depending upon the weather, if there have been large fluctuations from cold to warm to cold, that can adversely affect them.

Also, do you aerate the water? The O2 might be too low.

Was the pond frozen over solid.? If so the fish probably succumed to gasses trapped under the ice, Winter airation is very important to keep the ice open so gasses cant get out. A natural pond has what they call a rollover time in the spring. The bottom later of gunk, algae and debrea roll's over releasing gasses built up underneath it into the water this gas is instant death to fish. This is just speculation on my part. But these 2 things are a good possability.

Letta, I'm not surprised that you had a fish kill in your pond, given the type of winter we've had here in Michigan. It happens, quite often. We've had deep snow cover and weeks of cold, all making for thick ice over the pond that cuts off oxygen.

Did you have some type of aerator going this winter? If not, in future years you should consider it.

Otherwise, you'll just have to assess the situation and move on. If it's not a total fish kill, the populations will recover, and, in fact, perhaps a thinning out of the population may be good for the survivors. If it's a total kill, you will have to restock if it's not a naturally occuring population with some sort of access from other bodies of water.

Yes, it has been a bad winter here in lower Michigan, the pond did freeze over for at least two months or more. No, I do not not have an areator. I've always wondered if an an areator would freeze up because we have wacky weather and the temps can plunge drastically in record time. I'm not sure if any fish are left. It is going to be at least 50 degrees here next week for a few days. With the warm up I would imagine the fish will come out of dormancy and then I'll know. Also, one winter I tried to keep a hole opened in the pond but it was too cold and kept refreezing.

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