ID shark help needed!

[Ramesh]

Hi, I moved 3 large Pangasius catfish (ID Sharks) and after I released back into my 500g tank, two of them returned to life and started swimming around again, but one seemed to have problems with its swim bladder. The fish was really weak, listless and could not swim properly.

Has anyone had this happen or know what is wrong?

The fish really freaked out and were quite stressed being put in their 3 large plastic tubs. They did not do well despite the tubs being aerated, not that this should be an issue as they can breathe air anyway.

 

[Ramesh]

Update on the fish which has now recovered after spending the night recovering in the net at the top of the tank.
I very happy to say the least.

 

[fishierRob13]

Thats good to hear

 

[thebiggerthebetter]

They are a very nervous kind of fish. They can suffer from something related to a people's nervous breakdown and even fall into a zombie state.

When they go through too much stress, they may seem to return to normal but never loose pale stress colors and usually die within days. IME.

That fish take oxygen from both water and air. They cannot stay alive long just on air alone - the oxygen level in their blood will drop within minutes to harmful levels. Even if corrected, a brain damage has been done. This is also possible.

 

[Ramesh]

I am not sure about the brain damage or any other long term affects although I pretty sure the fish has returned to it's normal behaviour.
While in the net it was totally still and lifeless this morning as it was yesterday. I though I would lift it up and down to see if it could swim but it would not.
I eventually decided that I would release it to see what happens and it could stay upright but not get off the bottom. Eventually it started trying to swim and just got stronger and stronger eventually making it to the surface for a gulp of air and then seems to swim a lot better after that.

 

[thebiggerthebetter]

Great but I'd suggest to keep a close eye on it for at least a week and especially keep track of its color and other behavior to see if it is still stressed or not.