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4 votes

I used too much tetra pond algae control, and now my koi are dying

First, increase aeration to maximize the concentration of oxygen in the water. Stop feeding your fish to lower the waste production. Clean your filter and remove waste from the bottom of your pond to ...
trond hansen's user avatar
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4 votes

My koi has an odd scale that may be infected but I can't tell; how do I fix it?

First of all your tank is way too small. The minimum tank for one baby koi is 100 liters and this is for the first year you have it. Goldfish need about the same amount of water for one fish but they ...
trond hansen's user avatar
  • 19.6k
4 votes

Koi deaths after hail storm

I have a pond with koi. We have had two hail storms (in ten years) that required replacement of our roof shingles twice which the insurance adjuster authorized; so serious hail. No problem with koi or ...
blacksmith37's user avatar
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4 votes

Massive koi death in pond, without an apparent reason -- need help!

What I think might have happened before your koi started to die is this. As the temperature in your pond got above 20 °C, the koi eggs started to mature, and after some days of temperature still ...
trond hansen's user avatar
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4 votes

My koi fish ate a piece of gum

If the water is cold then it can be a problem, chewing gum will start to get soft at temperatures above 20 °C. So if the water is warmer than 20 °C it will pass through your fish - slowly, but it will ...
trond hansen's user avatar
  • 19.6k
3 votes

Are Koi Safe in the Summer?

It will mainly depend on pond exposure to the sun, it's location and construction, meaning that if you don't have enough water, enough shade and a good ratio fishes-water volume you will need to be ...
Omar Saadoun's user avatar
2 votes

Would an alligator decoy work to deter herons in a state where alligators don't live?

We live in the Northeastern U.S. and there are no alligators in our state or any of the surrounding states. Our fake alligator works great. We originally used it for raccoons which were eating the koi ...
lampreymast00's user avatar
2 votes

Would an alligator decoy work to deter herons in a state where alligators don't live?

Yes it will work but,yes there is a but it will not work in the long run herons learn over time so you can not be sure of the effect over time. You might try an motion activated sprinkler one bonus ...
trond hansen's user avatar
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2 votes

Koi fish injury from a Blue Heron

To treat wounds on koi you can use surface painting (applying it directly on the wound of your fish). This is first aid to your fish to avoid infection of the wound; in addition to this, you have to ...
trond hansen's user avatar
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1 vote

Are Koi Safe in the Summer?

My Koi pond is 80+ F most of the summer and probably reaches 90 F max. I have good aeration and no direct sun . The 2 koi don't seem to mind; they are about 24" and 30" long.
blacksmith37's user avatar
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1 vote

Do all koi have the potential to grow to 3 feet long?

I have never seen Koi advertised as any large type, although there are likely some genetic differences. In 25 years I have bought several Koi and raised a couple spawns. The adults have been 24 to ...
blacksmith37's user avatar
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1 vote

My Koi is acting skittish suddenly, and found injuries

I have had many Koi over the years and they are very non-combative. They won't even eat bit-size fish in the pond with them . Are there any other fish in the tank? Normally , if fish fight , the first ...
blacksmith37's user avatar
  • 1,844
1 vote

My Koi is acting skittish suddenly, and found injuries

It looks to me like your koi is having an ulcer or starting to develop one, this is not unusual in koi sadly there is no really effective cure for this. The picture showing the left side of the fish ...
trond hansen's user avatar
  • 19.6k
1 vote

Why did my koi pond fish die?

is your fish the one in the picture, I presume so? If so, how long was it taken before the fish died? It is swollen, as a female would be with eggs. Were the scales protruding a bit, like a pine cone ...
gary thackeray's user avatar

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