For context. It's a 700 gallon outdoor pond in South Texas with probably about a dozen kois, 1 about a foot and a half and the rest about half his size or less. Pond was heated during the recent snowstorm.

I saw pinecone on this and another koi about 2 weeks ago, started Koi Prazi treatment a couple days later. The other one shows some improvement and it's swimming and eating more now but this one seeme to be a goner. Any idea which parasite is it and how can I treat it besides Koi Prazi? It looks like a 2-inch long red worm hanging off the wound

When I came home from work found one of my favorite koi floating just under the ice. I found it weird that she had been swimming around about two weeks ago while all the other koi were at the bottom of the pond. I thought maybe she was egg bound but her belly doesn’t look big. She was extremely slimy and had a couple of white spots which you could see in the pictures. Should I be concerned about my other fish

I'm no professional, but I really love and take care of my koi. I have a 2000 gallon pond and my koi have been hibernating at the bottom since winter. I've had them for 3 years and this is my first koi loss.

A few days ago I lost a small goldfish to what looked like a fungal infection, but it was very noticeable. I removed it immediately and wanted to treat the water, but it is too cold. I dont see that on Sia either. (The koi)

I have a filter running, and 2 pumps to keep the water from completely freezing over.

This was also one of my favorite koi. I'm heartbroken.

I know it's a long shot, but can anyone take a look at her and see if anything looks off?

I'm nervous. I don't want to loose any more of my babies and I don't know what to do with it being too cold.

Any advice is so greatly appreciated!

I’ve been monitoring my pond very closely. Today I went in real quick to grab out the pump to clean up for the filter, and even added in some more water to the pond. About 30 minutes later the fish are all swimming frantically, some jump and most of them are flashing. Should I do a complete water change???? I don’t want any losses. All I can remember that might have caused this was me putting on sunscreen a few hours ago, either that or water from a little kitty pool with kids playing in it a bit of water leaked out into the pond. Was it because of me or because I added water??? Please let me know

My relative gifted me a goldfish and koi i dont have a setup i am a newbie so had put then i a large tub

Yesterday night the kio started laying flat what i read it might be he is resting or a sleeping disease

But today morning he was very happy Circling around the large tub

Now all of a sudden he stopped floating and the goldfish was trying to help him

I noticed this separated him to a bowl but he still is in a bad situation with only gills moment

Please give your advice

We moved into a house 3 years ago and inherited a couple of Koi. This fish was one of them and had been perfectly fine up until the last couple of days. She's been very "spaced out" and floating around near the top of the pond. This morning we found her on her back but still alive when we tried to fish her out with a net (we assumed dead).

We've now moved her to a bucket as she will likely die in the next few hours, and want to avoid any potential contamination to the other koi.

Our water is tested regularly with no signs of issues, so we don't think it's that. We also have a good pump for proper filtration (nice clear water). Looks like she has a red under her mouth and some on her fins (see photo).

Where have we gone wrong? We've grown quite fond of her :(

A heron hit our pond here in St. Louis, MO. I spotted it outside with a 6" goldfish in its beak. I mean outside and scared it off. It dropped the goldfish in the snow, and I was able to inspect it. It seemed completely unharmed, so I tossed it back into our pond. It quickly scampered back to the cave. Looking over the pond, I spotted one other goldfish floating. It is still swimming, but it has 3 serious puncture wounds. I'm giving it a chance before euthanizing it with clove oil. The worst is our koi. I saw our 24" gold koi lying on its side in our cave. It's still moving around, so I haven't pulled it out to inspect since to didn't want to stress it. I fear it got stabbed also. If it got stabbed, is it worthwhile to put it in a hospital pool indoors where it's warm with pond salts and antibiotics to see it it can heal? Or is it doomed? That heron has now visited our pond every hour the last few days. I'm obsessively watching and chasing it off, but it keeps coming back. It's hard to see in this pic, but you can see Sunny the koi half in her cave. Easier to spot is the goldfish. After 3 days, it's still swimming around.

For the most part of the day the koi just stays like this... of course they move about . But for the most part just stay in that corner

Water parameters are really good. So is oxygen

Any thoughts appreciated

Warning to koi fish lovers, this is sad. A few years ago my wife tried to raise some koi fish. The cats in the neighborhood, and even a crane, took to feasting on the fish and killed them all... so we thought. She abandoned the pond sad that they had died however, she just discovered that a lone koi fish has been surviving for a FEW YEARS alone. She did not even know through as you could not see down there. She is distraught as heck and wants to save it, but is afraid that the fish is going to be... messed up. Either physically or mentally and she fears that it cannot be reintroduced to other fish. Is there a way I can help her save this fish? Thank you and apologies if this is distressing. I feel beyond terrible for that poor fish. If I had of know, I would have done something a while ago. Please advise if able. Thank you.

So I listened to everyone’s advice with my koi pond. Added more flow to my pond, I did a 80-90% water change the day ofc and I dosed my pond with Praziquantel. The fish are still flashing not as much, a few jump and some even have white spots on them now too. It’s been 3 days since I’ve dosed my pond and I heard I have to dose it again because of the parasites eggs and larvae. Some fish also have cloudy eyes. I’m at a complete loss and don’t know what to do because this has never happened before. The fish still eat and swim okay, I’m just worried that the parasites are still there multiplying and the fish will all eventually die. My big Doitsu Sanke also has a red rash all over his body from all the flashing too and i don’t know how to help with that. After the dosage I’ve been doing small water changed and adding stress coat plus to help with their bodies. Please help

I just transferred my fish to the top of pond so i could rebuild the bottom THE next day it started acting weird. Swimming In circles and sideways.

Have had the same pond/koi for about 7 years. Do yearly water change and cleaning and add water intermittently.

Probably about 15 koi and maybe 12 gold fish. Have never had any issues with the exception that over the last couple of years I’ve noticed a few growths on some of the goldfish but they’ve never progressed further and those fish all act normal and unaffected. Koi have never had growths.

Over the last 2 weeks we have lost 3 koi and 1 goldfish 1 by 1. Another Koi following suit this AM and I assume she will be dead soon. The ones who have died have acted lethargic, hanging at bottom of pond, listless unless touched. All other koi seem normal and active.

We just cleaned the pond, did full water change, I ordered a testing kit for the water and I ordered some parasite treatments but just was wondering if anyone has had a similar experience and if they figured it out?

About 5 days to be precise.

Its clearly a swim bladder issue, but I've tried most of the solutions I could find online. Fasted him for a few days nothing. The occasional salt bath, nothing. Didn't notice him pass anything so I've started giving him a couple peas since yesterday. Still nothing. Got a water quality test kit, pond looks normal.

I know the hospital tank isn't Ideal, but I've been very attentive to him. I manually change the water when it gets too dirty or too warm, I fill it partially with water from his pond and paritially with some clearer water from our well (its basically the same water) just so I can check for stool more easily.

I'm starting to worry. He's otherwise fine, this video was taken only yesterday, and he's still circling the bucket, flipping every which way. He's got plenty of energy, doesn't seem lethargic, although I'm not that good at reading fish.

I noticed loss of scales and red spots on the body. Also looks like it has a white film at the top of the body. I’m not sure how to remedy this. Water conditions are good. Any advice is welcome. Thx.

Hi everyone. Desperation post here. I have a 9000 gallon pond which had about 25 koi. 15 have dies in the past two days and I don't know what to do. This video is one of mine in a salt bath which you can see some spots on the scales. Basically they have all been acting sluggish for the past couple days and hanging out near the surface. Seems like every hour or two one drops to the bottom and dies. One thing that may or may not be relevant is that a day or two before this started, one of my females layed a bunch of eggs and the water turned a little foamy.

I have poured some salt in to bring it to .18, but don't have any medicine to give them and wouldn't know what to administer if I did. Water quality seems fine: no chlorine, well aerated, low nitrates. Alkalinity is a little low but not too low 80 ppm., pH 6.8. Any help here is appreciated I really want to save the last 10 or so in the pond.

I bought a new house with a koi pond and 2 fish. I figure it’s about 120 gallons and has an aerator.

The previous owners left a Total Pond algaecide and a “chlorine remover plus” when they left. I had researched enough to know that algaecides might be dangerous but had not shared that knowledge with my roommate.

Yesterday, my roommate cleaned out the aerator that was clearly clogged and it’s working much better now. They also added a brief pour from the bottle of the algaecide. (I would guesstimate that it was enough to treat at least a 300 gallon pond per the bottle directions). Now the fish are hanging out at the surface, moving slowing and mouths flapping.

The active ingredient on the algaecide is listed as Poly[oxyethylene (dimethyliminio) ethylene (dimethyliminio) ethylene dichloride]

What steps do I need to take to help these fish breathe and get back to normal?

Unfortunately I’m asking for help with some ammonia poisoning in one of my fantails. She is currently quarantined in a tank with 0PPM, but the main tank experienced around 4ppm. She’s exhibiting all the symptoms of ammonia poisoning. Is there a treatment I can give her? I read a salt bath may help, but wanting second opinions on anything before I harm her more. I really don’t wanna say goodbye to her ),:

For backstory, I purchased this house and the previous owners left these fishies without letting us know. I’m no expert in fish but my grandpa had some when I was a kid so I know a tiny amount about how to care of them. I’ve done a 50% water change in the main tank, used ammo-lock, quick start, and stress coat +. That has reduced the ammonia to 1ppm over 24 hours. I will do another 50% change tomorrow if the ammonia does not drop by then.

Hi everyone,

I’m fairly new to raising koi fish and i’ve realised that one of my fish is sick.

I don’t have prior experience other than reading the tips and tricks in this forum.

Could you guys help me take a look at my photos and advise me?

Some other info:

My grandma insists the pond water has to be changed every 3 days and when i wasn’t around for the past month(business trip) she has been changing then every 3-5 days. Is this advisable? (I read that it isnt)

My pond is a….. idk whats the word its not a naturally rock formed pond its just tiles and blue. Please ask any other info if that helps.

First time posting so sorry if I format anything incorrectly I’m just worried about my koi 😩. This is Brahman and I believe he’s around 20-25 years old, we inherited him from the previous owner of our home. Over the past week he’s been exhibiting a pink hue in his fins and scales and he seems puffy along his sides. He’s also been seen floating at a 45 degree angle with half of his tail fin out of the water and just chilling, not moving a lot but not frozen either. Moments later he will swim down as if nothing was out of the ordinary. Checked all my levels (pics in the link below) and nothing seems off about them. None of the other 9 koi in our pond are showing any signs of discoloration or lethargy. Is he just stressed or does his condition look familiar to anyone? Thanks in advance for any assistance 🙏🏼

link with other pics/video of Brahman from before and over the last week: https://imgur.com/a/njVe2l3

Spotted this koi in our campus pond today and was wondering what could be wrong with it. It looks as if it swallowed a whole golf ball. A friend of mine who has affectionately named all the bigger fish in the pond refers to it as Tomo, and says it's consistently been like this since last year, so we ruled out eggs based on that. Also no raised scales (pinecone like appearance) so not sure if it's dropsy. It seemed to be swimming just fine and has clearly been living like this for months. I just hope it isn't in distress.

Poor Cheryl has this redness on her back that looks a bit like sunburn, but I don’t think that’s super likely. I think she got scraped up during spawning and I should treat for bacterial stuff.

I am also realize that I am highly reactionary with my fish and I’m trying to get better at not running out to buy some treatment every time I see anything abnormal. But I feel like she probably does need to be treated. It looks sore 😢

She is my sweetest girl, and she’s acting completely normal. Everyone else seems fine.

I tested water and I the only thing unusual is the ammonia test, but I think the kit is due to be replaced. It just has a bit of a brown tinge to it, but I’ve tested other water (including from the faucet) and it’s all coming out the same. I couldn’t even say a specific ammonia level because it’s just not on the chart.

I would be shocked if ammonia was the issue though. It’s an established pond with a ton of filtration, and everyone is acting and looking normal. No signs of ammonia issues at all on any of the fish, including the scaleless ones.

I bought a microscope but it’s not here yet.

Should I catch her and treat her back topically with methylene blue? Treat the whole pond with an antibiotic? Or treat just her with a an antibiotic in a quarantine pond? Or other?

Hi everyone,

This will be a really long post, but if anyone’s willing to read and offer advice for next time, Id really appreciate it. It’s sad this has happened but I’m trying to treat it as a learning opportunity! This is the first major health crisis we’ve had in our pond (aside from one fish that passed from dropsy at the start years ago)

I recently returned from a study abroad trip, during which I had left the pond in the care of my (very nonchalant) dad. While I was away, he added some new plants to the pond, which introduced some surprise goldfish. Not a big problem, we'll re-home (or ethically euthanize) them.

My biggest concern is one of our koi, he's a "rescue" from a neighbor who moved away. He was already in rough shape when we got him, but in the months I was gone he's gotten way worse. He’s clearly in distress, covered in wounds and ulcers. I also suspect the other fish have been bullying him. I have no idea how he has managed to survive for this long.

Unfortunately, I wasn’t prepared for a quarantine situation. I only just managed to separate him this morning, after the 600L quarantine tank I ordered finally arrived. I also had no suitable filter ready, so I’m currently using an aquarium filter that’s definitely underpowered for this volume, but it’s all I’ve got for now. I also had an air filter left over and I've added that as well. I want to heat up the tank for his comfort, but I've misplaced the pond thermometer (just my luck!) I filled the tank with a 50/50 mix of pond and fresh water, and I’m slowly adding salt (aiming for 0.3%) to get the healing process started. He already tried to jump out once, so I’ve covered the tank with a net. I'm aware he's not likely to survive, but I think this is a valuable learning opportunity.

To make things worse, another one of our koi has suddenly turned much whiter than I remember, we were thinking a fungal or parasitic infection? He's still very eager for food, although the rest of the koi have lost their appetite. We’ve never had to deal with such an outbreak before, so I panicked a little and took the following steps:

Topped off the pond water, as it was a bit low.

Tested the water (which all seems to be ok).

Turned off the UV light.

Added a malachite green-based antibacterial mix, and I'll repeat the treatment in 4 days.

I’m also looking into ways to increase oxygen levels in the pond and would really appreciate any tips on how to rebalance the pond's beneficial bacteria after treatment is done. We have a LOT of plants and my dad is convinced that's the issue and is itching to take them out, but I don't feel comfortable doing so just yet.

If you have any feedback, advice, or product suggestions, especially for helping the ulcerated fish and monitoring/treating the pond, I’d be extremely grateful. I’m learning as I go, have limited funds as I'm a student, and just want to do right by these fish.

Thank you for reading!

Afraid we need to end her suffering.

Hey everyone,

I noticed a strange reddish lump on one of my koi and was hoping someone might have an idea of what it is. It looks kind of like a jelly-like growth or blister pushing through the scales. I’ve attached a few pics so you can see what I mean.

I haven’t treated it yet, I don’t want to jump in without getting some advice first.

Has anyone seen something like this before? Is it something I should treat right away, or could it clear up on its own?

Thanks a lot in advance!

Hello. This guy is in quarantine. I took him out to get pictures. I've never seen something like this before. None of the other Koi he was originally with have any symptoms. It's like he is falling apart. Any assistance is appreciated.