Chlorine susceptibility per species: barb / catfish / cichlid

[Andyroo]

Have you tested your water?

No

If I did not test my water...

1. ...I recognize that I will likely be asked to do a test, and that water tests are critical for solving freshwater health problems.

Do you do water changes?

Yes

If I do not change my water...

1. ...I recognize that I will likely be recommended to do a water change, and water changes are critical for preventing future freshwater health problems.

Sages,
What might wild-type tinfoil barbs be more susceptible-to than inbred irid. sharks?

* We've had a fish-kill event in a client pond, 30% (4) of the tinfoils only. Established fish 4~7" long each. Also in the pond are albino iridescent shark, alb.oscar, common pleco, yellow lab, guppy & alb.mystery snail.
* The tinnies didn't look a million bucks on our pop-in visit ~40hrs ago, and photos of the dead suggest that these had been dead for a while, possibly floating but that was't reported. More may be dead on-bottom.
*No other species displayed as any less than healthy 40hrs ago, nothing else dead reported by vila staff just now.

On the visit everything looked great: grass wasn't recently mowed, gardens untended etc (owner is out of town...); however, the overflow was (very recently) overflowing & very-very full. It had been afternoon raining, but not crazy & the maintenance guys said they'd been hose-filling. If they forgot the hose for an extended period of time, that villa complex's water can be/is notoriously Chlorene'y.

So, nothing suffered but Tinnies. Could this be
Chlorene from an overfill that burned gills to die a little later?
A garden chemical?
Nitrates? They Primary water-mover pumps seem to be down, though the cataract/waterfall feed is running fine.

I'm on-site this afternoon.

Thanks,

 

[Backfromthedead]

I cant speak definitively but i lost some platinum tinfoils after a water change once. I just figured i changed too much water at once and messed up dosing prime. But it did seem curious that they died so easily.

 

[Andyroo]

Gardener-lads reported today that no more fish have perished, so whatever it was it seems to have run its course.
Thanks Backfromthedead , this does suggest a particular susceptibility for these small-gill'ed athletic barbs.

 

[taylorgodiva28]

my fish died when my daughter fed her with spoiled food

 

[Hybridfish7]

In my experience, anything that requires higher levels of oxygen is more susceptible to damage from chlorine. Of the fish I've lost to chlorine incidents, most were tetras or malawi cichlids. Not sure about the oxygen requirement on malawi cichlids exactly, but I believe I recall them needing a lot more of it than other things. Contrarily I have forgotten to dechlorinate tanks with bettas or gourami before leaving the house, only to come back hours later to find them... perfectly fine. Probably something to do with the labyrinth.

my fish died when my daughter fed her with spoiled food

i read that as "my daughter died" for a second and had to do a double take.