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Dead Cory with red between scales

ScareCrow

ScareCrow

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Hi All,

I got 6 new corys on Thursday and just found one dead. Does anyone no what this could be. The fish looks absolutely fine apart from the red streaks between the scales (please see pic).
None of the other fish are showing these marks.
I don't think it's 'red blotch' disease or haemorrhagic septicaemia as it's confined to just between the scales and doesn't look like any of the pics I've found.
Any ideas much appreciated.

Edit: just found a second dead Cory from the same batch but it had no discoloration.
I don't know when they died (sometime between last night and this morning) but everything else parameter wise appears ok. So I'm guessing that the red on the first fish appeared post death.
IMG_20240831_103946.jpg
 
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I’ve seen this with corydoras occasionally, never seems to affect the whole batch but may kill one or two. I’m guessing it’s bacterial. I’ve never found anything available in the UK that cures it. I’m assuming you’d need a decent antibiotic. Sorry I can’t be of more help.

Is that a CW111?
 
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Conort2 said:
I’ve never found anything available in the UK that cures it.
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Agreed - I have had to import medication from the US as you simply cant get antibiotics for fish without a vet sign-off.
 
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Conort2 said:
I’ve seen this with corydoras occasionally, never seems to affect the whole batch but may kill one or two. I’m guessing it’s bacterial. I’ve never found anything available in the UK that cures it. I’m assuming you’d need a decent antibiotic. Sorry I can’t be of more help.

Is that a CW111?
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Thanks Conort2.
And yes unfortunately it's CW111. GM had them on sale, with my recent success in breeding eques and after days of deliberating over the purchase I talked myself into buying them.
 
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ScareCrow said:
Thanks Conort2.
And yes unfortunately it's CW111. GM had them on sale, with my recent success in breeding eques and after days of deliberating over the purchase I talked myself into buying them.
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Ah I thought it looked like one. That’s such a shame. Have you spoken to GM? As far as I’m aware they’re a pretty hardy species with no specialist needs.
 
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I've done 2 50% water changes today. 2 out of the 4 look pretty good although I have seen them flicking against the sand. The other 2 aren't moving much and have their dorsal fins down which isn't something I've seen before, though not had this species before.
I've upped the temp very slightly 23c from 22c.

I don't know if something like Esha 2000 might be worth ago? I'm always a bit nervous bombarding new fish with medications.
 
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Are your other fish OK at this point? Just the Corys?

I pondered over the substrate rubbing and thought of flukes, which can cause red blotches in severe cases. But I have not known it to kill in such a short space of time. Chlorine-type issues can do that, but I am assuming that your aquarium water is well-treated. Fast deaths are usually bacterial-related, and I am not sure if ESHA is going to help fast enough. Perhaps someone else has better ideas.
 
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John q said:
I've yet to find an antibiotic that's actually saved the life of a fish.
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Agreed. The 'shotgun' medication I have important comes with a pre-warning that it will work 50% to 70% of the time at best. But it did (seemingly?!) save two of my guppies when all the other medicines were doing nothing. However, it's hard to prove what fixed it—or whether it fixed itself.
 
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Not disputing your experience @Bradders

When a bacterial infection invades a fish it's generally game over, add to that the time lag of "us" diagnosing it, and finding said medication...

Antibiotics are are wonderful thing, however if you need them to keep a healthy aquarium I'd suggest something is off.
 
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ScareCrow said:
I've not, I don't imagine they'd cover it and as you say CW111 are pretty hardy from what I've read.
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No I doubt they would but it might be worth seeing what conditions he was keeping them. I’ve seen pictures of these on Facebook and unless they’re completely different stock which I don’t think they would be, they’ve always looked in top condition.
 
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Conort2 said:
No I doubt they would but it might be worth seeing what conditions he was keeping them. I’ve seen pictures of these on Facebook and unless they’re completely different stock which I don’t think they would be, they’ve always looked in top condition.
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Good point, I'll give it a try. As you say the fish always look good and with his experience and devotion to the hobby I suspect it's something I've done/not done.
Bradders said:
Are your other fish OK at this point? Just the Corys?
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Yeah it's just a few juvenile gold laser and duplicareus in there that I missed when clearing out the tank ready for their arrival. So the tank is very mature and none of the other inhabitants are showing any symptoms.
 
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