Dead fish

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18 Jan 2017 18:31 #1 by robert (robert carter)
Just checked my tropical tank , dead fish everywhere , have just netted 12 dead fish . Did my usual 20% water change last night and all was ok going to bed . Now i reckon the cause was feeding some sinking stergoen pellets at lights out because i have run out of catfish wafers . The dead fish were all large enough to eat these and they all had very enlarged bellies , all the small fish are fine . I feed these pellets into the pond where there are koi to feed the stergeon and never had a problem . So why did they kill the tropical fish ? Have just done a 25% water change incase there are any trace elements from the pellets left in the tank . Please give your accessment of what went wrong . Incidently ammonia and nitrite levels perfect

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18 Jan 2017 21:46 #2 by robert (robert carter)
Replied by robert (robert carter) on topic Dead fish
Just found 2 more dead fish this time small ones , dont know whats going on , any ideas lads?

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18 Jan 2017 22:12 #3 by gunnered72 (Eddy Gunnered)
Possibly oxygen depletion...

Or possible PH crash...

Hard to actually know...

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18 Jan 2017 22:28 #4 by robert (robert carter)
Replied by robert (robert carter) on topic Dead fish
Loads of oxygen have a powerhead with a venturi on it going in the tank , ph is always a bit low due to the tap water but got a reading of 6.4 . To me it has to have been the stergeon pellets but why , the koi are all good . The fact that is is mainly the bigger fish and that they all have very swollen bellies points to the food

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18 Jan 2017 23:29 #5 by nomad (pat murphy)
Replied by nomad (pat murphy) on topic Dead fish
I think theres some reaction going on with cold water pellet food being fed in a tropical tank,the bigger fish are going down first they can eat the bigger pellet but as the pellet brakes down the smaller fish will succunb.

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19 Jan 2017 18:53 #6 by robert (robert carter)
Replied by robert (robert carter) on topic Dead fish
Have just added a 6 inch airstone to the tank to rule out the lack of oxygen theory, still think it was the food seeing all the fish had very swollen bellies

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20 Jan 2017 12:53 #7 by irish-zx10r (James feenan)
sorry to hear about your fish have you tested your tap water maybe there could be a problem there hope you find out what went wrong

Something fishie going on here

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20 Jan 2017 13:46 #8 by Jonlate (Jon Late)
Replied by Jonlate (Jon Late) on topic Dead fish
Did you autopsy any of them and see what in there belly?
Ian at aquatic village will do it for you if you are to squeamish to do it yourself.
That would give you a definite answer as to the problem.

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20 Jan 2017 14:07 #9 by robert (robert carter)
Replied by robert (robert carter) on topic Dead fish
Thanks for the post lads , i now have a 12 inch airstone enstalled in the tank , didnt open the bellies of any of the fish , but they were all very bloated still reckon it was the food , everything has settled down again . Just would love to know the cause that way i can prevent it happening again

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