Why are my koi huddled together?

One of the main reasons is because it's a self-defense mechanism. When people are scared, they either fight or run and hide. Fish aren't known for their fighting skills, so they hide instead. By hiding, your koi fish are protecting themselves from some form of danger, including new ponds.
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Why do fish huddle up together?

Over crowding, a lack of oxygen, over-feeding and poor nutrition, are stress factors that may lead fish to huddle together at the bottom of the pond.
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How do you know if your koi are happy?

A happy Koi fish has adequate room (not overcrowded with other fish), well oxygenated water, a diverse environment with places to hide (bubbles, waterfall, plants, etc.), clean water (correct filter), and is fed with quality food.
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Why do koi stay in one place?

Poor water quality, including excess nutrients, ammonia, or a fluctuating pH, can cause koi to become sluggish and immobile. What is this? One of the leading causes of koi immobility is poor water quality. High concentrations of nutrients can stimulate pathogenic growth in your pond and reduce oxygen levels.
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Is it normal for a fish to stay in one spot?

A fish may linger near the surface because he's trying to breathe more easily. Remember, fish breathe dissolved oxygen—not oxygen that is already combined in the H2O molecule. Naturally, these dissolved oxygen levels tend to be higher near the surface, where interaction between air and water takes place.
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Pond Koi behavior and what it means.



Why are my new koi laying on their sides?

Poor water quality may also affect a koi's behaviour, with them becoming more stressed as conditions worsen. Swimming Sideways behaviour could be another indicator of stress, but in this case it is more likely caused by poor water quality, parasites, a swim bladder infection, or a combination of the three.
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Why are my koi fish chasing each other?

The chase is a prelude to bumping the female around plants and rocks so the spawning process can take place. Even if you have two couples in your pond, the males may still compete with each other for both females. The size of male koi will have a lot to do with this behavior.
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Why do koi rub their sides?

Just like the flashing issue, excessive scratching or scraping on the sides of your pond, or objects in your pond, likely means that you have a parasite issue.
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Do I need to add salt to koi pond?

Consistent exposure to low salt levels can help reduce stress levels while improving gill function and oxygen intake in your fish. More importantly, pond salt aids in the development of a stout slime coat on your koi that helps protect against parasites, bacteria, and other toxins in the water.
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What month do koi fish breed?

When Do Koi Spawn? Temperature and time of year matter when it comes to koi breeding. Fish typically spawn when water temperatures are 65° to 70°F. In many ponds, this usually happens in late spring or early summer between May and June.
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How do I know if my fish are mating?

Mating Ritual

Signs that your goldfish are ready to mate include white spots along the gills of the males, and the female will become fatter and more rounded. The male will then chase the female around the tank to encourage her to release her eggs.
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Why do fish huddle in corner of tank?

Just like sickness, they stay in the corner because they feel vulnerable. Unfortunately, there's not much you can do for this one except wait for it to pass. Lastly, they may be doing it because there aren't enough hiding places in the tank—all fish like lots of hiding places where they can feel safe and rest.
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Why are my fish gathering at the top of the tank?

Usually, your fish goes to the top when he's not getting enough oxygen. Unlike you, he uses his gills to breathe the air that's already in the water. However, in some circumstances, there's not enough oxygen in the tank for all of the fish to breathe easily.
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Why are my fish staying on one side of the tank?

Heat. While most quality aquarium heaters are good at disbursing heat in such a way that the water stays at a constant temperature, you may find fish hanging out on one side of the tank rather than another because they prefer the temperature.
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Do koi flash for fun?

This can result in koi flashing behavior, as they work to free their gills of this excess food. You can see this more clearly in the video here! Koi flashing after eating is actually one of the most common reasons many koi flash, and could be an indicator that the food you're using is not suitable to the fish or pond.
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How do you know if your koi has parasites?

Clinical Signs:

Increased mucus production on skin may make fish appear cloudy or bluish. Pale Gills. Respiratory Distress, gaping at the surface or near splashing water features. Increased redness, sores or ulcers on the skin.
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How often should pond water be changed?

Just as with an aquarium, you should replace a small portion of the water once a week to prevent it from going stale. Keeping on top of this means that you can remove some of the debris that collects in the pond from rainwater and the wind.
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Do koi fish communicate with each other?

Just like humans, fish can also communicate with one another. The most common ways they achieve this are through sound, color, bioluminescence, motion, electrical impulses and smell. These forms of communication are usually used to help navigate, call for spawning, alert predators to keep away, and while fighting.
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Why are my pond fish lying on their side?

When a fish is unable to control its depth, or starts swimming sideways, upside side down, or head or tail down, it may have "swim bladder disease." A fish with swim bladder disease can be a troubling sight to see, but it can be treated.
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How long does it take for koi to settle in a new pond?

Introducing Koi Fish To A New Pond. You should wait at least 72 hours before putting fish in your new pond. Even if only the water is new. This way the water temperature and chemistry can level out.
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How long does new pond syndrome last?

About 3 weeks after adding fish you may still see green water. About 5-6 weeks after it will have naturally turned to clear water.
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Why does my fish just sit there?

Listlessness: If your fish seem tired and lethargic, it can be as a result of many factors. One common cause is improper water temperature. If your fish's water is too hot or too cold, they will be very inactive. Check your heater and verify that your aquarium is at the right level.
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