What’s happened to my cory?

[Fishkeeper123]

I’ve noticed that one of my corydorras has a lump on it and I’m wondering if I need to do anything and what it is?

 

[Fishkeeper123]

Any ideas?

 

[CassCats]

Looks to be clinostomum, a type of parasite that makes a capsule type cyst under the skin or in the muscle tissue of fish. It's not common but is occasionally seen.
It's harmless and cannot spread to the other fish.


Clinostomum when it is in fish is the 2nd life stage of this parasite, which it will not develop into a reproductive adult unless your fish is eaten by a bird, who is the final host for this parasite.


You may see it in fish that are farmed outside in tropical areas or in wild caught fish. In a sterbai cory, it could be either or as they're both wild caught and farmed in the hobby.


It poses NO health risk to your fish or you.


You can try to treat with flubendazole, but it's not a guarantee to get rid of it. But it's worth a try if the nodule bothers you.

I've had it in some wild caught cories before, it went away on them with flubendazole. I had a rainbowfish with it, flubendazole didn't work in his case.

Had to dig back awhile to find the cory pic, but look towards the base of the tail and you can see one on this fish

 

[Fishkeeper123]

Thanks for the advice I’ll look into the treatment but may or may not do it. I can’t tell you if it’s will caught or from a fish farm but I’ve assumed for must of my fish they are from a fish farm but might be wrong. I’m so relieved it’s not something contagious or deadly, thanks for the help.

 

[CassCats]

It's just ugly lol but yeah, I can understand the worry when you don't know what it is.

There's ways to manually remove them, but I don't recommend most doing it without knowing how to safely sedate a fish and having access to sterilized equipment to do so

 

[Fishkeeper123]

I’m really struggling to take a photo, but I’m unsure on your diagnosis you made a few weeks ago. The fish no longer has the white and instead it’s turned red. Is this what should happen? Here’s the best photo I could get but will send a better one if I get one. He’s the one at the back.

 

[CassCats]

Plausible it's bacterial in nature, though the area seems more improved and may be a healing wound at this point.