r/Koi

About a month or so ago, I noticed one of our Koi had become lethargic and had some red tint colouring to his skin. At the time I was and still am very unfamiliar with flukes. After we noticed he was really starting to show he wasn’t well, barely moving and not eating we had a koi specialist visit the pond. He scraped the fish and said it came back positive for flukes. We went and bought treatment off him immediately and treated pond same day. Unfortunately the koi passed away that morning. A week after we were advised to do secondary treatment to kill any eggs that still remain etc. Now another one of my koi’s is showing a red tint to skin, and three of my biggest goldfish are now showing same behaviour as first koi, very lethargic, not eating and remaining at the bottom of the pond not moving. Has anyone had experience with fluke infected pond? I feel like the whole pond is doomed and they are all just going to start dropping like flies and i’m not sure what to do. We have had these koi for 30+ years and never experienced this devastation,

Pretty funny, in that "Go away, you asshole" kind of way. Pond is netted, so the threat to my fish is (theoretically) minimal.

Hi everyone,

I'm looking for some guidance on how to clear up my koi pond. The water is currently very murky/cloudy, even though my parameters are great.

Here are the results from my recent liquid tests:

Ammonia: 0

Nitrites: 0

Nitrates: 0

pH: 7.8 (sometimes around 7.6)

My Setup:

Pond Conditions: The pond gets full sun all day long, but I have installed a shade sail to block the direct sunlight (you can see it in the video).

Filtration: I run a SunSun CPF-10000 pressure filter (11W UVC, 10,000 l/h) connected to a 100-liter DIY barrel filter. Inside the barrel, I have 4 layers of foam/sponges, a thick layer of polyfill (perlón), and about 10 kg of high-quality bio-media at the top.

Electricity: My entire property runs on off-grid solar panels, so I can't upgrade the 11W UV light to a higher wattage due to power restrictions.

The Situation:

Last year, I had a lot of string algae (algas filamentosas), and that actually kept the water crystal clear. This year, I don't have that issue, but the water has become very murky. A few weeks ago, I added 4 kg of activated carbon, and it worked great, keeping the water clear for about 3 or 4 days during that time. However, it went back to being very cloudy lately. Two days ago, I cleaned the filter, and the polyfill was completely brown and packed with gunk.

Since my parameters are completely fine, what do you think is causing this persistent murkiness? Could it be single-celled algae or fine suspended organic waste that the filters aren't catching? Would you recommend adding a second shade sail to block more sun, or what else can I try?

Any advice would be highly appreciated!

Focus of the pic is our 2’ goshiki koi GusGus, one of the 4 survivors of a catastrophic ammonia spike last fall that wiped out our other 22 koi, as well as all of our goldfish and all 3 species of minnows, in our 4700gal pond. Above him is our ~20yro red-eared slider Bubbles🐢, and our 2 1/2’ fellow ammonia poisoning survivor and house favorite shiru utsuri (whose genetics didn’t get that utsuri notice—thus she she cheap🤣) Phoebe to the left. You can also see part of our new-ish goromo koi in the left corner, as well as a single rosy red minnow/xanthic fathead minnow scouring the bottom for leftovers. I believe that is our losing-his-lemon hariwake to the right of the goshiki.

Vandaag bij het tuincentrum 3 leuke baby karpers aangeschaft om op te kweken. Nu eerst in quarantaine, waarschijnlijk geen van alle een officiële benaming (zo wel, let me know). Maar alle gezond zonder gekkigheid.

Hello, we recently bought a house and inherited some Koi with it. We were quite happy at first, but it's become apparent that they're more work than we hoped for and we would rather remove the pond and get some garden space back.

We think, well pretty much know, the pond is too small for the amount of fish so we constantly have to do partial water changes.

Pond is around 500 gallons - We think.

There's 7 Koi, 3 gold fish (It's surprisingly hard to count them...)

We believe they are around 5-7 years old, the previous owner raised them.

Can anyone help explain how we can find a new home for them? Not necessarily sell, we'd happily give them away to a home that will care and appreciate them.

We figured some enthusiasts from Reddit may be able to help us find them a new home. A better home.

I hope this is within the rules, as we're not looking for financial gain. So wouldn't strictly be advertising.

Thanks a bunch!

Noticed this fish swimming upside down today. It is alive. It's able to move its tail and get around, but it's been stuck on the surface since I've noticed. Should I leave it, try to save it, or put it down?

Unfortunately no images of the fish, but I did get to see the current owner feed them - at least 20, possibly more. The ones I saw I would guess to be 15-25cm long, but just an estimate. Wasn't initially disclosed that there were fish, and the water surface is green enough you can't see much more than 5-10cm deep.

I was planning on removing the pool, as it seems fairly aged, and the yard space would be nice for the kiddo. Does anyone have recommendations on what to do with them? Friends keep saying 'sell them, they are worth a fortune', but I'm not sure I'm comfortable with that, especially as I know nothing of their history, health, etc (or the quality of the water they are in for that matter with how green it is). I certainly wouldn't object to some extra money to offset the time to properly home them / cost of removing the pool, but it's far less a priority.

There are two other ponds on the property, but I couldn't imagine them being big enough for more than a few, and even then, if rather them not be cramped unnecessarily.

Property is on Vancouver Island if geography helps.

Thanks for any advice you may have

Edit: I should say that I saw personally approx 20, the owner thinks there are closer to 50, and her son insists there are more than 100. I won't know any more precisely for a few more weeks until we have possession, but would rather plan in advance if I can :)

What you think happened to him ? Only thing I can say is did was add some algacide lately. He did look a little beat up floating ?

I bought a house recently with a small pond and this is one of 4 koi in it as well as 10 goldfish. Recently this guy developed what I believe is an ulcer. I cleaned the main filter again this weekend and just yesterday a secondary filter fountain with a UV light arrived and I put it in as well. Also did a ~50% water change and I’ve poured in some API Melafix the past couple of days and some pond salt too but it doesn’t seem like it’s healed much at all. How long might it take to resolve and what else can I do to help?

Hello, r/Koi,

My mother passed away suddenly and I want to keep her Koi pond in my family. She has raised them for 30 years. We currently have about 10 fish that are 2.5 ft long. Plus a lot of smaller fish. Above is an AI mockup (not to scale) of the space I want to transform and a super rough of the idea. We are in Southern Indiana.

I was going to buy a 12x20 gazebo and then find a local company that can dig it out quickly.

I helped her dig her previous four ponds, but she didn't optimize any of them for the fish or maintenance. They were piece-milled as needed. "Pump too small? Buy another." type of thing.

I would love to build a permanent installation that requires as little maintenance as possible. I'm willing to put in all the research and work, but I wanted to start with a trusted community first.

Here are the questions I think are currently relevant:

1. What filtration systems should I consider?

2. Do I need any UV sterilization to help with algae?

3. Is there another algae control method that is safe for fish?

4. What type of pumps should I install?

5. How deep should I dig it? (3ft has been our standard so far but we get winters that freeze our lake top.

6. The gazebo provides shade, bug netting, curtains, and protection from herons... are there other pests (raccoons?) that I need to protect against?

7. What do I not know that I don't know? Suggestions?

Thank you in advance.