- Jul 11, 2020
- Reaction score
Hi guys! New member here. I’ve lost 4 koi in the past week! They all have the same type of injury or disease. What is this and what do I do? Never had a problem like this before!
What’s a crodad!?
I have never had a problem like this and honestly never tested my water! I guess I should...Did this happen suddenly or have the fish had some redness that worsened over time?
Do you have testing kits to check your water quality? That would be my first step.
So sorry about these fish.
It’s called a crawdad! It’s not very likely that the fish were attacked by crawdads, mud bugs, crayfish, or crawfish, but sometimes an injury from a predator attack, or a parasitic attack will get infected and turn into an ulcer!holy cow! dont know what that is but I am posting this in hopes people that check my profile see this and respond! my best guess is flashing, which is a parasite, but that looks a lot more serious than that!
it could be something along the lines of a crodad eating the sides out of the fish, because in my area there was a largew crodad infested pond that they lost all of the fish to crodads catching the fish
Hello and welcome @Mattr ! So sorry!
We would love to try to help you figure this thing out, but first we need some information from you:
- what size is your pond?
- how long has it been up and running?
- how many and what size fish do (did) you have?
- do you have any predators where you live — like herons, raccoons....?
- have you recently made any changes to your pond (such as adding new fish)?
- did you notice any unusual behavior from these fish — anything like flashing, top breathing...?
- do you test your water?
- can you test your water for us and tell us the NUMBER results for ammonia, nitrites, nitrates, pH, and KH? This needs to preferably be from a liquid test kit, like API master kit.
Thanks so much! The pond is approximately 2000 gallons and has been established about 20 years.
Never tested the water. We have a LOT of birds and have had Heron problems before.
I did lose a lot of fish over the winter, but they just disappeared and I assumed it was a predator. I had found a fish quite a distance from the pond and realized I never put my net up this winter. Terrible mistake on my part!
A friend gave me a bunch of his fish and these are the ones that are dying!
I used Melafin when I noticed injuries on the first fish and he died immediately after dosing
Reading this I guess I can see that the fish from my neighbors pond might have had an infection
Got it! Thanks!@Mattr We always like to start at the beginning when someone has a fish problem. That means getting a history of your pond. There is nothing we can help you with from just a picture. Please go back and look at the list of questions above, and if you could add a few things like where you live — and add anything else that other members might ask you about your pond.
Also, please don’t worry when members make snap judgements! Doesn’t mean that is your problem.
We have found that in most cases of fish death or illness, poor water quality is the problem, so we like to find out what we have to work with.
How many gallons is the pond in question?Oh I had about 10 fish all between 5 and 10 inches give it take
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