A Sick Harlequin Rasbora

hakova

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Hi all,

Let me tell you about my tank first. It is a 10 gallon, heavily planted tank with Eheim Ecco 2232, temp 81F, pH around 6.0-7.2 (mostly 6.0), CO2 injection with a yeast-based system. CO2 around 30 ppm by a drop checker. 7 hours a day light cycle, adding fertilizers for plants via EI method. I started the tank in late June and stocked it on 7/26/09 with 6 Harlequin Rasboras and 5 ghost shrimp, after confirming the fishless cycling was completed by handling 5 ppm of ammonia to 0 ppm of ammonia and nitrites. The shrimps could not survive more than a week, and I didn't buy new ones since then.

About a week ago, I found one of the Rasboras caught by the external filters intake from its tail. At the time I found it, it was already dead, so I don't know if it died because it was caught or it was caught because it was already dead. I think the latter scenario is more likely to be the real story here. Anyway, I kept observing the remaining five closer since then, and I noticed that one of them was lying on the substrate on its chin and seemed like it had a hard time to maintain its balance. With a little stimulation (getting the fish net touch it), it "woke up" and started swimming around again, however it is swimming closer to the surface and apart from the remaining four. At a closer look, which actually is very difficult because these are tiny and very active fish, it looks like its mouth is always open. For the last 4-5 days, I saw that it has not been eating any food, although it gets more active and joins the others when the feeding time comes. I am not sure if it has a dislocated chin, or an eroded nose, but it sure looks like it has a chin that extends longer than its nose, which gives it a look like that is the reason why its mouth seems like open at all times.

Recent readings from my tank indicate 0 ppm of ammonia and nitrite, pH 6.0, nitrate 40 ppm, gH 20, kH 40. I just did a 70% WC today after these.

Unfortunately, I don't have a quarantine tank. I am suspecting some bacterial (anaerobic?) infection that might have eroded the nose of the sick fish and gave its funny appearance. What would you recommend? I don't want to euthanise the sick fish, but I don't want it to spread something that might be harmful to others either. Any help will be greatly appreciated.
 
Here are some pictures. Notice the notches marked with arrows. The first one (clockwise, starting from 9:00 o'clock) is the mouth or chin, second one (10 o'clock) is around the nose. The third one at 12 o'clock, might just be the normal notch between the head and body, I am not sure.
dsc01697e.jpg

Here is another view:
dsc01692a.jpg

And lastly, this is a picture of the normal ones, just to compare with:
dsc01698k.jpg


What do you think this is? A destructive infection, a kind of neurological damage preventing jaw closure, or something else? In any case, I am worried to keep it with others but I don't have many choices other than that or euthanasia.
 
Not sure what's wrong with the fish but if you are treating the whole tank this should protect the others anyway.

I don't think there's a lot more you can do but other members may have some more ideas.
 
Not sure what's wrong with the fish but if you are treating the whole tank this should protect the others anyway.
...
Thanks for the response. The thing is, I am not treating the tank now, since I don't know what I will be treating and what is used to treat that.
 
Google Enteric Red Mouth and see what you think. There's an article about it on Badmans Tropical Fish and the picture on there looks similar to your fish. Hope this might help.
 
I've lost harlequins to open mouths and nobody seems to know what it is.
Open mouth can also mean something lodged in the mouth or sores in the mouth.
 
Google Enteric Red Mouth and see what you think. There's an article about it on Badmans Tropical Fish and the picture on there looks similar to your fish. Hope this might help.
Excellent reference glolite, thanks a lot. I actually thought my fish's condition looked more like an external bacterial infection. I will head to a local Pet Smart to get a bowl, isolate the fish in it and treat it for a week or so with Maracyn.

@Wilder: Thanks for the input. I will presume the diagnosis of bacterial infection and treat it as above. I think it is more common than Red Mouth, it goes with clamped fins, and weird behavior which is consistent with what it has at the moment. I will let you guys know about the progress.
 
Red mouth desease don't come across it much.
I think the mouth goes red and you get other symtoms like reddening of the stomach region, septicemia.
 
I cannot find the sick fish anymore. I am pretty sure it passed away, but not being able to find the body is very worrisome. I even cleaned the canister filter, it wasn't there either. I will take another look tomorrow morning. The tank mates (all Harlequin Rasboras) probably didn't eat the body right? AFAIK, they are very peaceful fish. I hope the infection does not spread.
 
That's sad. RIP little fishy.

I would keep an eye on the other fish and just treat if you see any more developing the same symptoms. As Wilder said, enteric red mouth is quite rare so it could have been something else, hopefully not infectious. Maracyn is pretty strong stuff and may affect the filter bacteria, although it didn't when I used it years ago.

Good luck
 
One of my Neon tetras recently developed this same syptom, except one gill was enlarged and he appeared to be only breathing through this side. Could see into mouth and down into stomach area! He Also lost a little red but not much. No sign of any bacterial or viral infection that I could see so I blamed my Gourami who can get a little pi55ed when fish enter his terrotory.

Found the Neon the other day dead, which I expected. All others seem ok so just keep an eye on remaining fish for now - especially as they are fairly new!
 
Thanks a lot for the replies. I will keep an eye on them and start treating them sooner than later if symptoms appear.
 
Never know a harlequin to survive with an open mouth.
it's quite common for harlequins to have an open mouth sadly. Nobody seems to know what it is.

If you have anymore problems get back to the board.
Good Luck.
 

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