All My Big Fish Are Dead

[emmuscat]

Hi everyone i have an aquarium setup with malawi Yellow labs for over 2 years i never had problems ,except today after coming back from work i found all my big Yellow labs are dead ,but the small ones looks healty ,can someone help me figure out the problem what information is needed, i went to several fish shops in my country but not to much experions about Malawi.

Thanks
Emmanuel

 

[dthoffsett]

I'm sorry to hear that, to help you out we'll need to know a few things.

Tank size:

pH:

ammonia:

nitrite:

nitrate:

kH:

gH:

tank temp:

Filtration:

Stocking, species and amounts:

Fish Symptoms (include full description including lesion, color, location, fish behavior):

Volume and Frequency of water changes:

Chemical Additives or Media in your tank:

Tank inhabitants:

Recent additions to your tank (living or decoration):

Exposure to chemicals:

Digital photo (include if possible):

 

[-germ-]

Hypoxia?

 

[emmuscat]

Hello , so today i took a sample of my water to the Fish laboratory and found that the water was very good when it comes to PH ---- KH --- GH---- NO 3 ---- NO2

Then i was asked how many fish i have in my 1 metre aquarium were i had 7 big yellow labs and around 12 yellow labs (Around 1.5cm)


I do 33% water change every 15 days including vacumm .


So i comcluded the all fish died because of the water tempreture which went up 31 c


Thanks for trying to help

 

[dthoffsett]

While that's pretty warm, I'm not sure it that's what killed them. What were your exact readings? What do they consider fine? What are all of the dimensions of your tank? You should be doing 30% water changes weekly, but if for time constraints you need to do them bi-weekly, I'd up it to 40-50%.

 

[-germ-]

Honestly it must have been hypoxia (well2my mind)...
Too hot=less oxygen.
Large fish die but small ones don't whats the difference aside from size and age? Oxygen requirement....
Yeah i'd be interested to know the tank size as well....
Probably being presumptuous too much tonight...

 

[emmuscat]

Thanks for trying to help, the reding are below

For now i can tell you that my aquarium size is 39 x 16 x 20 height.


Regarding the water change i do it every 15 days since the condition of the water was good when checked with tetra test 5 in 1 stick.



NO3 NO2 GH KH PH
25 0 >60d >60d 7.5

 

[Lynda B]

Get yourself a drop test kit. Those paper kits aren't worth.... well, the paper they're on.

I'm unfamiliar with your particular species of fish. How old do they live to be? If you got them all at once, is there a possibility they all died from age? But then again, even that would be spread over a number of days, it seems. It's got to be something internal to the tank.

I'm not sure how to read the numbers you've posted. You have a nitrite reading?

Again, unfamiliar with your fish, but.... I do water changes weekly, 50%.

 

[emmuscat]

Hi the fish went all in just 1 hour .

The redings are

NO3 25
NO2 0
GH >16d
KH >10d
PH 7.5

These test are from the fish Laboratory and not my test they where tested in tubes separate 1 by 1

 

[-germ-]

Do you have much movement at the waters surface?
How big were the adults (inches approximate guess) same question for the little ones.
I honestly think it was hypoxia, as i have already said, the heat rose; reducing the oxygen content of the water and the bigger fish having a higher oxygen requirement died off, but the little ones lived due to their smaller oxygen requirements....
Could be wrong

 

[TylerFerretLord]

This is eerily similar to what happened to me.

Do you feed any of the following foods?

the following fish foods have been recalled due to possible melamine contamination

HBH Pet Products, Inc. Crab and Lobster Bites 1.3oz
HBH Pet Products, Inc. Goldfish Bites 1.5oz
HBH Pet Products, Inc. Goldfish Nibblets 4.3oz
HBH Pet Products, Inc. Goldfish Nibblets 8.0oz
HBH Pet Products, Inc. Goldfish Nibblets 32oz
HBH Pet Products, Inc. Goldfish Nuggets 32oz
HBH Pet Products, Inc. Shrimp Pellets 1.6oz
HBH Pet Products, Inc. Shrimp Pellets 4.6oz
HBH Pet Products, Inc. Shrimp Pellets 9.1oz
HBH Pet Products, Inc. African Cichlid Attack 3.8oz
HBH Pet Products, Inc. African Cichlid Attack 8.0oz
HBH Pet Products, Inc. African Cichlid Attack 28oz
HBH Pet Products, Inc. Oscar Bites 1oz
HBH Pet Products, Inc. Oscar Grow 3.8oz
HBH Pet Products, Inc. Oscar Show 8oz
HBH Pet Products, Inc. Super Cichlid Sinkers 29oz
HBH Pet Products, Inc. Baby Bites 1.2oz
Sergeant's Pet Care Products, Inc. Atlantis Betta Food, 1.2 oz
Sergeant's Pet Care Products, Inc. Atlantis Color Enhance Tropical Fish Flake Food, 0.88 oz.
Sergeant's Pet Care Products, Inc. Atlantis Goldfish Flake Food, 0.42 oz.
Sergeant's Pet Care Products, Inc. Atlantis Goldfish Flake Food, 0.75 oz.
Sergeant's Pet Care Products, Inc. Atlantis Goldfish Flake Food, 2.15 oz.
Sergeant's Pet Care Products, Inc. Atlantis Tropical Fish Flake Food, 0.42 oz.
Sergeant's Pet Care Products, Inc. Atlantis Tropical Fish Flake Food, 0.88 oz.
Sergeant's Pet Care Products, Inc. Atlantis Tropical Fish Flake Food, 2.25 oz.
Zeigler Pelleted and crumbled shrimp feeds

if you have any of these products, stop useing them and return them to your LFS
source
http/www.avma.org/aa/petfoodrecall/products.asp

 

[-germ-]

Surely the smaller labs would have died as well, if fed infected food?

 

[TylerFerretLord]

Surely the smaller labs would have died as well, if fed infected food?

Hmm, didn't think of that.

I guess it was hypoxia then.

 

[emmuscat]

It is me agian so

1 no there is not to much movement in the service of the water

2 size of fish adults 4 inches and youngs which are still alive are around 1 inch

3 the food i use is Tetra Doromin for Ciclids

 

[-germ-]

Its in now way certain but i would definately put hypoxia as the most likely cause, obviously when linked with the temperature jump....
Did you notice abnormal gill colouration/swelling on the dead fish?
I'd increase surface movement with the filter outlet or possibly an air stone on the off chance this may happen again.
Can't actually remember if you saw the fish die or were out when it happened?
If you were did they show any odd behaviours?
--zip--