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Winterizing Goldfish in Ponds

One of the challenging aspects of raising goldfish in outdoor ponds is how to ensure that they survive the critical period during winter. Usually best practices involve early preparations and right at the start of autumn, when temperature begins to dip lower and daylight hours become shorten, the goldfish will generally be rendered less active and as such will put on weight. Therefore during this period, it is a good idea to reduce the amount of food feed to your fish so that they maintain a certain balanced weight.

By late fall, the pond must be thoroughly cleaned to ensure that the water is crystal clear. Debris accumulating at the bottom of the pond must be removed because the intention is to avoid buildup of harmful gases that will remain trapped beneath the ice surface which has nowhere to escape and this will lead to the demise of your goldfish. Try to increase the frequency of water changes and at the same thing avoid wide fluctuations in pH and other water parameters. When the night turns colder, you can even consider using plastic sheeting supported by a solid frame in order to cover the pond surface so that this will help to trap the heat and maintain water temperature to prevent sudden temperature shock causing stress to your goldfish.

When the water temperature starts to approach the freezing level (about few degrees close to about zero Celsius), pond aeration must be immediately stopped so that you don’t risk freezing the whole pond. This will ensure formation of ice only at the surface while your goldfish remains safe underneath it. All the other pond accessories like ultraviolet sterilizer and filters can actually be removed for storage while heater can be left at the pond as a precaution in case you will need to operate it. During the hibernation period, goldfish will start to lose their body weight and their immune system will become weak but there is nothing to worry about because usually they will survive through the winter. As long as the water quality is properly maintained and cleaned before the top surface freezes up, everything should be fine.

At the end of the winter, when temperature starts to rise and the ice begins to melt, immediately follow up with small amount of water changes and give the pond a good cleanup. The quantity of food that you feed to your goldfish should be gradually increased, and during this time, offer some nutritious live foods for them to regain back the lost weight. The beginning of spring is also a good time for goldfish breeding to take place as the natural rise in water temperature will induce spawning.

More about caring for pet goldfish:
» Goldfish health
» Best goldfish care
» Other interesting facts
» Putting goldfish in community tanks



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My fascination and interest towards aquarium fish has led me to devote my time towards caring and learning about this wonderful pet.

Aquarium fish keeping is a very challenging and exciting hobby. When I first started, I never knew much or have the necessary guidance back then because none of my family members were actually a keen hobbyist. And because of that, I’ve encountered numerous failures and the worst part is having to deal with dead fish every time when you started to grow fond and getting attached to my pets. However, I persevered and took steps to find out and search for information from other hobbyist, apart from the knowledge gained and learned from my own experience and research. The blog that I’ve created here is meant to share useful information and tips about aquarium fish keeping so that new hobbyist will not make the same mistakes that I’ve made in the past."

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