China and Japan aren’t especially warm during the winter! So long as the pond has a hole in the ice for oxygen-carbon dioxide gas exchange, your fish will overwinter with relative ease. In most temperate countries, so long as your pond is at least 3-4 feet at the deepest portion, your Goldfish can hibernate over the winter.Īs I said earlier, Goldfish and Koi are temperate fish. In the winter, you’ll typically bring them indoors if the pond is too shallow and at risk of freezing over. Since most outdoor ponds (except for container ponds) are far too large to be heated efficiently, we assume that your Goldfish will be able to tolerate at least summer temperatures. Pond Goldfish are a little different in their needs. I would avoid keeping Fancy Goldfish below 60℉, especially large adults that have lived in heated aquariums their whole lives. Give them time to adjust, bringing the temperature down a degree per day or so until you reach your desired range. If you know your Goldfish was raised in warm, gentle temperature conditions, don’t shock them by suddenly adding them to an unheated aquarium or pond. Many are even raised in tropical conditions alongside Livebearers, Tetras, and other traditionally tropical fish. I recommend checking out my guide of choosing an aquarium heater something that best meets your needs! Goldfish that Should Have a Heater:įancy Goldfish like Telescope Eye or Black Moors have been raised in stable aquarium conditions for decades now. Shopping for a reliable heater is sometimes a challenge given the variety of options out there. But if the temperature tends to swing towards colder than this I recommend having a heater to keep the water from growing too chilly. So long as your home has a decently warm constant temperature you may not need a heater even for Fancy Goldfish. You still shouldn’t let the water temperature go much above 75℉ in fact 68-72℉ is ideal for them as well as their less gently bred cousins. If you’re keeping these somewhat sensitive Fancy Goldfish, a heater is a good idea to help keep your temperature stable. But Fancy Goldfish sometimes can’t take sudden shifts in temperature like their ancestors can and almost never down to near-freezing. This means they will interbreed with ease and have very similar requirements.Īll Goldfish are temperate fish and don’t absolutely require a heater, unlike fish like Discus that come from the steamy tropics.
Whether you have a Black Moor, Shubunkin, Oranda, or feeder Goldfish they are all technically Carassius auratus, a small carp originally from East Asia. There are dozens, if not hundreds, of different types of Goldfish.
But what about your Goldfish – is your cute Moor or Shubunkin actually shivering and asking for warmth?Īs it turns out, the answer is both yes and no! It really depends on a couple of factors: What Breed is Your Goldfish?īelieve it or not the variety of Goldfish you have will drastically affect how cold-hardy it can be. Goldfish, for all their simplicity, can be confusing fish to keep at times! We’ve all seen an unheated Goldfish bowl or outdoor pond.
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