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Help please! 150 goldfish fry died in 2 days!


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  • Regular Member

I have about 300 oranda fry that I keep in a 40 breeder that's only filled halfway. I change out about 75% of the water daily and feed the fry decapsulated bbs 3 times a day. This is the 2nd week of raising the fry. First week not major loss but this week enormous amounts have been dying. Any advice would be much appreciated! Thanks!

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  • Helper

I'm sorry! Fry rearing isn't my specialty but I'll pop this along to the others mods and helpers. Can you please fill out the form information for us so we have more data by which to help you?

Test Results for the Following:

* Ammonia Level(Tank)

* Nitrite Level(Tank)

* Nitrate level(Tank)

* Ammonia Level(Tap)

* Nitrite Level(Tap)

* Nitrate level(Tap)

* Ph Level, Tank (If possible, KH, GH and chloramines)

* Ph Level, Tap (If possible, KH, GH and chloramines)

Other Required Info:

* Brand of test-kit used and whether strips or drops?

* Water temperature?

* Tank size (how many gals.) and how long has it been running?

* What is the name and "size of the filter"(s)?

* How often do you change the water and how much?

* How many days ago was the last water change and how much did you change?

* How many fish in the tank and their size?

* What kind of water additives or conditioners?

* What do you feed your fish and how often?

* Any description of the behavior or conditions leading up to the die off? Cloudy water or lethargy?

This is technically our diagnosis and treatment checklist but it will be helpful here as well.

Edited by Arctic Mama
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  • Regular Member

I learned the hard way that an onrush of water can damage fragile fry spines. How do you introduce the water?

I also lost many by too rapid a temperature change between our day and nighttime temperatures.


Do you have another food to offer them? Repashy? Or a seaweed-based pellet you can grind up? Some use egg yolk. Do they seem to be finding the baby brine shimp (BBS) you give them? I had to raise live BBS because mine demanded that their food "wiggle."


How closely are the water params matched to the existing? pH? Temperature? etc.

There are just a few questions I would have if I were a mod, but I'm not. 

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  • Regular Member

Fry are a fragile thing.

A slight imbalance and "poof" a whole tank gone etc.

Ok questions for you to answer and check.

Whats the water temp? Should be around 25-26c (someone can convert to F)

decapsulated bbs cysts? Or are you hatching them?

When i used frozen bbs i found my tank became very messy and polluted. When i swapped to live bbs the tanks were alot better.

What filtration have you got? Fry dont like big currents.

Have you treated for fluke? An outbreak of fluke will wipe out a batch of fry very quickly.

Do you have salt in the water?

I always have my fry at 0.1% - 0.15% until about 1.5months of age.

And will raise it to 0.3% if a problem occurs.

The salt seems to keep any nasties at bay until fry are strong enough for medicating etc.

I dont like to medicate fry to soon as they dont seem to have a good reaction and the meds can do as much damage as good. But around 1.5 months is usually a decent age i found.

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