How to keep them outdoors and what to look out for

For keeping ornamental fish such as goldfish,There are two patterns: those who keep their goldfish indoors and those who keep them outdoors. Outdoors, compared to indoors, there are more external enemies and the goldfish may die unexpectedly due to weather changes or living creatures.
However, there are some things that can be learned by keeping them outdoors that cannot be learned by keeping them indoors. For example, allowing goldfish to live at the mercy of nature can improve their coloration and increase their resistance to stress and their chances of living a long life.
In order to obtain such benefits, the owner must support and care for the fish rather than leaving it 100%. We hope that you will read the explanation and use it as a reference in your search for the best approach for your goldfish.

When keeping them outdoors, the first thing to consider is the time and duration of daylight. When kept outdoors, water lily pots and other containers are often placed in areas that receive a lot of sun, but if they are placed in areas that receive long hours of sunlight, the water temperature may rise.
Particular attention should be paid to the hours of sunlight in summer. Just one or two hours of sunlight in the summer can raise the water temperature by almost 5 to 10°C. If this happens, it can cause the goldfish to weaken, so care should be taken.
Also,It is even better if you also consider the time of day when the sun is shining. For example, the probability of contracting a disease changes if it is installed in the east direction versus the west direction. Goldfish installed in the western direction have a higher risk of getting sick.When the sun shines in the west, the water temperature rises, but after a short time, the water temperature drops just as the temperature drops rapidly at night. The sudden change in water temperature in a short period of time puts a considerable load on the goldfish's body. This will cause their immunity to decline and increase their risk of contracting diseases. In the east (morning sun), the water temperature gradually increases over time, so there is less chance of a short-term change in water temperature than in the west.
If you can only set up in a location that receives long hours of sunlight, or if you can only set up in the western direction, you can prevent rapid changes in water temperature by installing a bamboo blind to regulate sunlight instead of trying to force sunlight into the room.

The major difference between those who keep their goldfish outdoors and those who keep them indoors will be outside creatures. For example, birds such as crows and small animals such as cats may come to take goldfish and other animals as food.When kept indoors, such risks are not so great, but when kept outdoors, they are always present.
First of all, it is important not to be targeted. If they do not know that you have goldfish, they will not come after them, so one of the first things you can do is to add water plants such as hotei grass so that they will not be noticed even if they are seen from above.
Since hotei grass and other water plants can also be operated as food for goldfish, there is no harm in including them. Also, if they are noticed, simply changing the location where they are placed to a place where people often pass by, such as at the entrance, may also have an effect. Many people who keep their animals outdoors have had their animals stolen by birds or cats, so by preparing well in advance, you can prevent this to some extent, so please give it a try.

When kept outdoors,We also need to keep in mind the changes in water quality. For example, water quality can change as rainwater comes in. Other changes may occur, such as sun exposure due to algae growth caused by direct sunlight.
Thus, when goldfish are kept outdoors, unexpected changes in water quality can cause them to become ill. Even if you try to take measures to prevent the water quality from changing, there are various causes, so there may be no way to counteract the problem.
So, the first thing you should do is to prevent rainwater from getting in. If you are keeping them in small pots, rainwater may enter there in such quantities that you have to do a water change once. In addition, rainwater may contain a lot of bacteria, including pathogens, so it is best to prevent it. If you know that it is going to rain, you can simply place a glass lid over the pot to prevent rainwater from getting into the pot, even if only a little.
A few measures may prevent deterioration of water quality, so please take as many measures as possible if you are concerned.

Special care should be taken with rainwater when keeping goldfish and other ornamental fish outdoors.As explained above, rainwater entering the water in which goldfish and other fish are kept may change the quality of the water. However, if the water is in a place with a large amount of water, such as a pond, there is little fear that the water quality will change significantly due to rainwater entering the water.If the container is outdoors and can only hold a small amount of water, such as a water lily pot or aquarium, you should be careful. In particular, if you have ever had rainwater enter the container and cause it to overflow, we recommend that you move the container immediately or cover it with a lid on rainy days to keep rainwater out as much as possible. Even if you pay attention to sunlight, birds, cats, and other outside creatures, many people are blind to rainwater, so please be careful about rainwater as well.
Also, if you are going to keep them outdoors, try to keep them in green water to prevent the water temperature from rising due to sunlight and the risk of being discovered by outside creatures.