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Blister like lesion

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  • Regular Member

Hi guys

Few days ago i bought a pearlscale goldfish which seemed totally healthy and fine. Ate food well and everything was ok.

after 1-2 days some small red spots appeared on his skin and i tought it could be a kind of invasion by other fishes since it seemed really like being nipped.

they the red marks started to develop within 1-2 next days and then small blister or bubble like lesions appeared on his body and now all the scales seem inflated and the fish does not eat well as before.

now i am think of it may be a kind of parasite or bacterial infection since the other goldfish in the shop has also now developed these blister like lesions.

i havr started metronodazole treatment with a dosis of 20mg/gallon and the red marks are now less but the bubbles are growing and still the fish does not eat well.

is there any adivce you can give me please????

does any body have experienced such a thing before?

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  • Regular Member

Bubbles on a pearlscale indicate dropsy. Dropsy is generally incurable. The fish was sick when you got it. Return it to where you got it from with the other sick fish in the shop, never shop there again, and nuke your tank and search for healthier stock.

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  • Helper

And some pearlies just get them seemingly asymptomatically. It’s very hard to tell until or unless things decline whether they’re the harmless kind or the indicates-trouble kind, but I agree with Mj, Pearl scales are distinctly difficult to treat if they’re dropsied.


if you can fill out our diagnostic form and provide some pictures I may be able to tell you a bit more.



Test Results for the Following:

* Ammonia Level(Tank)

* Nitrite Level(Tank)

* Nitrate level(Tank)

* Ammonia Level(Tap)

* Nitrite Level(Tap)

* Nitrate level(Tap)

* Ph Level, Tank (If possible, KH, GH and chloramines) 

* Ph Level, Tap (If possible, KH, GH and chloramines)

Other Required Info:

* Brand of test-kit used and whether strips or drops?

* Water temperature?

* Tank size (how many gals.) and how long has it been running?

* What is the name and "size of the filter"(s)?

* How often do you change the water and how much?

* How many days ago was the last water change and how much did you change?

* How many fish in the tank and their size?

* What kind of water additives or conditioners?

* What do you feed your fish and how often?

* Any new fish added to the tank?

* Any medications added to the tank?

* List entire medication/treatment history for fish and tank.Please include salt, Prazi, PP, etc and the approximate time and duration of treatment.

* Any unusual findings on the fish such as "grains of salt," bloody streaks, frayed fins or fungus?

* Any unusual behavior like staying at the bottom, not eating, etc.?

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  • Helper

I do want to reiterate, though. We can treat, as this sounds like it’s secondary to an infection if there are red lesions too, but the likelihood of treatment working is very very low.

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