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Questions tagged [koi]

Koi are domestic carp, that have been bred to be optically pleasing. They are related to goldfish but grow bigger.

Koi are domestic carp, bred to be optically pleasing. The japanese word koi (鯉) actually stands for carp.

Koi are related to goldfish, but grow bigger in size. Koi that have grown over 50cm are not unusual. The colors of koi vary, most commonly are red, white or black, or a mixture of two or more colors with different patterns.

Koi are often considered as a status symbol by their owners, as a result they can sometimes become very expensive in auctions. This holds true for big specimen or fish that sport a specific pattern. (E.g. white koi with a red dot on the head which resembles the Japanese flag.)

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Will feeding other fish in the same pond have an impact on my koi in winter?

There are two sturgeons in the pond which need to be fed during winter. As far as I know koi don't need food during frost periods and only a small amount when the pond isn't frozen. I kept feeding the sturgeons on one spot of the pond, unfortunately…
Baarn
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My koi has an odd scale that may be infected but I can't tell; how do I fix it?

I saw it this morning and started researching because I am dealing with an ich outbreak due to recent overcrowding. It hasn't changed or gotten worse but I don't know if it's infected or a disease. If you can't see my koi has an orange yellow…
user13978
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My Koi is acting skittish suddenly, and found injuries

I've been keeping 2 young koi in an aquarium for a year now. They've grown bigger and accustom to me. Their tank is about 55-60 gallons, and I live in the northeast. They were from the same shop and same breed, and they also look similar so they're…
Puffy Bubby
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My koi fish ate a piece of gum

I have a koi fish pond with about 14 to 15 inch (around 37 cm) koi. The neighborhood kid threw a piece of gum in the pond and one of my koi ate it; how harmful is this?
Debbie
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Does this koi carp injury need attention, and how would I treat it?

We have a large koi carp (I would approximate 50cm long) that has an injury to its head — a gash which has left a triangular flap of flesh about 4cm wide. There is no sign of blood, and the inside of the gash is white. This injury occurred within…
Rob Barrett
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Would an alligator decoy work to deter herons in a state where alligators don't live?

I've heard that placing an alligator decoy in a pond will deter herons from visiting stopping by to eat all the expensive koi that live in it. This made me curious, because I live in a northern state where alligators don't exist, would a decoy still…
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Massive koi death in pond, without an apparent reason -- need help!

I am still experiencing unresolved problems. Shortly after 5/1/2018, I lost all of my koi due to a huge ammonia spike above 8.0ppm. I did multiple water changes to no avail, including a 100% water change. For the past 3 weeks, my filter has been up…
Franz
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Koi fish injury from a Blue Heron

My Koi fish was attacked by a Blue Heron about 2 months ago. I chased the Heron off and it dropped the fish. I put the fish back in the pond but it had a couple of puncture wounds. It is still alive, but stays mostly on the bottom and when it tries…
April
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Why did my koi pond fish die?

My family got 3 pond fish which were koi. I realized one fish was getting bigger/swollen looking. After a few months he was getting really swollen or big and during the month he stopped eating. I was so worried because he was the kind of fish that…
droopygus
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I used too much tetra pond algae control, and now my koi are dying

I had 15 beautiful koi, all about 5 years old. They were very healthy, but the other day I put too much Tetra algae control in their outdoor pond, and now 2-3 of my koi are dying a day. If I put them in another pond I’m scared I will shock them. i…
Pat Boston
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My koi fishes are dying every day

It all started last week. My big koi started to spin out of control and died the same day. I went to the pond place and they gave me a parasite treatment bottle, with instructions to use it for 3 days. I used it for 2 days, then had to go away for 2…
Melissa Garcia
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Koi deaths after hail storm

I have had my pond for 8 years and have never had any problems until a hail storm a few days ago. I went out and found them all dead. I then googled it and think it was due to the change of temperature and then it depleted their oxygen. Does…
Lynn Henaman
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Koi fish sick and lethargic

I have a very large (8 feet by 12 feet by 6 feet deep) koi fish pond with a waterfall and extensive filtration system I inherited with the house. In it is a very large and older koi (18 inches long the size of a small salmon) and a smaller, younger…
Steve
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Are Koi Safe in the Summer?

I currently have two young koi fish, and they need a bigger pond. My dad and I are planning on making one in our backyard, but it gets incredibly hot in the summer. Is this dangerous to the koi, and is there a way to avoid it?
CoffeeWithCream
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Do all koi have the potential to grow to 3 feet long?

I have seen many videos with koi that are 3 feet (around 90 cm) long. However, I also know that some koi from desired varieties are really expensive. If I am buying koi from Petco and Petsmart, does it have just as much likelihood of growing to…
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