Help Id what may have killed fish

[tankguy]

I had some fish in qt for a fellow member and came home today to all of them dead. Cow fish has these black marks over its body and I’ve never seen them before. Anyone have any ideas

 

[Bruce Spiegelman]

Got a before pic of the Cow? And the usual questions -- were they eating? Swimming? How many fish? What types? Water parameters checked? Pleasantly engaged in extracurricular activities or water sports?

 

[tankguy]

I didnot take a pic before and Ive never had a cow fish. I was concerned with how many fish he brought over ( 7 total ). All fish ( except the Anthias ) were eating and swimming just fine. QT tank is in in good shape.

 

[Apon]

well cow fish can be toxic. Not sure about the black marks - can see that well in pics. maybe video better? do the other fish show same marks?

 

[tankguy]

no just the cow fish. I wonder if it released some sort of toxin in the water to take out the other fish

 

[tankguy]

also says Poisonous when stressed or dies. I think that could be what happened to explain all fish going at once

 

[rygh]

Black spots don't seem like any common diseases.
My guess is that they are just some post-mortem reaction. A bit like rigor mortis.

Check ammonia levels. That is the most common cause of mass-death in QT.

Cowfish and Cucumber poisonings seem similar.
There is concern about some species. But it seems really rare in aquarium ones.
But not a lot of clear scientific evidence either way.

You will likely never know.

 

[ashburn2k]

Any critters survived?


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[euod]

also says Poisonous when stressed or dies. I think that could be what happened to explain all fish going at once

Pretty much it.

 

[Ibn]

Any of the marks on the fish look like the black mark on this anthias?

 

[tankguy]

I did not see that Eric but noticed the black marking on the cow fish were growing quickly

 

[tankguy]

Any critters survived?


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None

 

[Bruce Spiegelman]

With all dying at the same time I'd assume it was the Cowfish in the corner with poison. Probably a better bet than the butler in the study with the candlestick anyway.

 

[Adit0]

aw damn thats terrible