Corry Fry Fry Dying!? Why?

[newfishaddict]

Hi newfishaddict,

This is a terrible development!

While it's natural to expect the loss of a fair number of fry, it should happen over the entire course of their development, not suddenly like this.

First thing to suspect is, if you are using a frozen product, perhaps it is tainted. It might have defrosted and been refrozen somewhere along the line. If it even looks a little bit off, replace it with a package from a different lfs. Sf05 used frozen bbs with success, so you should not have this problem.

I don't think you can blame the LiquiFry either, unless enough accumulated in the tank that harmful bacteria is breeding in it. If you have been keeping up your daily water changes, this should have eliminated that possibility.

When fry (or corys in general) die suddenly, it's almost always related to some kind of bacterial problem, and in this case, that could only come from the feeding since they are isolated from other fish. I would keep up the water changes, perhaps dividing it into 2 smaller ones a day since the bbs are likely to spoil fast. (This is why I prefer microworms since they remain alive for some time in the water.)

As a last resort, you might want to try adding some MelaFix. This is a mild antibacterial agent. Since the fry are still so small, don't use it unless you absolutely have to. If you use it, try a half dose and make very sure it is well mixed with water before putting it in the tank.

Good luck with them. I hope they pull through.

One fry is still barely alive. I have moved him to a quarantine bucket with antibiotics in it. I expect that "his" chance of survival is about 1% or less.

Now , It is obvious that bacterial growth occured in my tank, the smell is now terrible.

I want to know:
1)how antibiotics affect growth/development of eggs and fry?
2)is it common to see cory fry with dark digestive tracts?
3)from what I know about microbiology; the chance of pathogenic bacteria "taking over" the tank would decrease with the use of an established filter, any comments? (an established filter will contain other "good" bacteria that will complete with the "bad" pathogenic bacteria for nutrients.....) I think I will consider using an established filter at a very very slow flow rate for future fry tanks....

Thanks for anyone who can help/comment....
Seasons Greetings

 

[newfishaddict]

Hi newfishaddict,

This is a terrible development!

While it's natural to expect the loss of a fair number of fry, it should happen over the entire course of their development, not suddenly like this.

First thing to suspect is, if you are using a frozen product, perhaps it is tainted. It might have defrosted and been refrozen somewhere along the line. If it even looks a little bit off, replace it with a package from a different lfs. Sf05 used frozen bbs with success, so you should not have this problem.

I don't think you can blame the LiquiFry either, unless enough accumulated in the tank that harmful bacteria is breeding in it. If you have been keeping up your daily water changes, this should have eliminated that possibility.

When fry (or corys in general) die suddenly, it's almost always related to some kind of bacterial problem, and in this case, that could only come from the feeding since they are isolated from other fish. I would keep up the water changes, perhaps dividing it into 2 smaller ones a day since the bbs are likely to spoil fast. (This is why I prefer microworms since they remain alive for some time in the water.)

As a last resort, you might want to try adding some MelaFix. This is a mild antibacterial agent. Since the fry are still so small, don't use it unless you absolutely have to. If you use it, try a half dose and make very sure it is well mixed with water before putting it in the tank.

Good luck with them. I hope they pull through.

I think it is interesting that the frozen food companies say "dont use if thawed" and "sterile product"....This makes no sense, if the product is sterile then storage temperature does not matter, as far as safety is concerned anyway...

 

[Inchworm]

Now , It is obvious that bacterial growth occured in my tank, the smell is now terrible.

I want to know:
1)how antibiotics affect growth/development of eggs and fry?
2)is it common to see cory fry with dark digestive tracts?
3)from what I know about microbiology; the chance of pathogenic bacteria "taking over" the tank would decrease with the use of an established filter, any comments? (an established filter will contain other "good" bacteria that will complete with the "bad" pathogenic bacteria for nutrients.....) I think I will consider using an established filter at a very very slow flow rate for future fry tanks....

Thanks for anyone who can help/comment....
Seasons Greetings

Hi newfishaddict

It's not unusual for light colored fry to show the color of the food they have eaten though their skin. I have a batch of C. aeneus Gold Shoulders that get orange bellies when I feed them Ocean Nutrition Formula One flake food which is orange in color.

Your tank should definitely not smell, especially with the water changes you've said you do. Perhaps you've used way too much LiquiFry.

As for using a filter, I don't do it and have had great success raising corys. Other people raise them using different techniques and you are certainly free to do as you choose.

Good luck with your future spawns.

 

[newfishaddict]

Now , It is obvious that bacterial growth occured in my tank, the smell is now terrible.

I want to know:
1)how antibiotics affect growth/development of eggs and fry?
2)is it common to see cory fry with dark digestive tracts?
3)from what I know about microbiology; the chance of pathogenic bacteria "taking over" the tank would decrease with the use of an established filter, any comments? (an established filter will contain other "good" bacteria that will complete with the "bad" pathogenic bacteria for nutrients.....) I think I will consider using an established filter at a very very slow flow rate for future fry tanks....

Thanks for anyone who can help/comment....
Seasons Greetings

Hi newfishaddict

It's not unusual for light colored fry to show the color of the food they have eaten though their skin. I have a batch of C. aeneus Gold Shoulders that get orange bellies when I feed them Ocean Nutrition Formula One flake food which is orange in color.

Your tank should definitely not smell, especially with the water changes you've said you do. Perhaps you've used way too much LiquiFry.

As for using a filter, I don't do it and have had great success raising corys. Other people raise them using different techniques and you are certainly free to do as you choose.

Good luck with your future spawns.

Inchworm, certainly I didn’t want you to feel I have disregarded your advice. I feel your suggestions are very helpful and drawn from experience. I am just trying to explore all options.

I think the most likely explanation is: an over abundance of "food" for bacteria resulting from left over food in the tank from the substrate, parent corries, and "silly" breeding net, that were in the tank before the spawn. And,the sick parents with a bacterial infection introducing the pathogen to the new "quarantine" tank. The spawn was much unexpected and next time I will be ready....

I am going to try without substrate and a filter as you suggest, inchworm, for another try. This time I will have microworms ready...

ok, where do I get microworms....?
Optimistic,
FishAddict
Kev

Now , It is obvious that bacterial growth occured in my tank, the smell is now terrible.

I want to know:
1)how antibiotics affect growth/development of eggs and fry?
2)is it common to see cory fry with dark digestive tracts?
3)from what I know about microbiology; the chance of pathogenic bacteria "taking over" the tank would decrease with the use of an established filter, any comments? (an established filter will contain other "good" bacteria that will complete with the "bad" pathogenic bacteria for nutrients.....) I think I will consider using an established filter at a very very slow flow rate for future fry tanks....

Thanks for anyone who can help/comment....
Seasons Greetings

Hi newfishaddict

It's not unusual for light colored fry to show the color of the food they have eaten though their skin. I have a batch of C. aeneus Gold Shoulders that get orange bellies when I feed them Ocean Nutrition Formula One flake food which is orange in color.

Your tank should definitely not smell, especially with the water changes you've said you do. Perhaps you've used way too much LiquiFry.

As for using a filter, I don't do it and have had great success raising corys. Other people raise them using different techniques and you are certainly free to do as you choose.

Good luck with your future spawns.

RE: way to much liquifry, I used half of what the label suggested. I only had 13 fry so:
it said use 10 drops per 10g 2-4 times a day. I used 4-6 drops 2-3 times a day....

And, I carefully cleaned the tank(including the sides and bottom) with a siphon hose....

I strongly suspect it was the introduction of the pathogen via the sick parents....and accompanying high nutrient conditions for bacterial growth, due to my inexperience and the unexpected spawn...I will try again....

 

[Siamese Fighter05]

Hey

Sorry i hadn't read this thread but i've been busy away from the forums
Although it looks like you have already decided that the death of your fry is due to the bacterial infection already in the tank, i thought i would share my experience with using frozen BBS.

I fed my fry liquifry for the first two days after they had absorbed their yalk-sacs and then moved them straight onto frozen BBS, perhaps you left it a little too late? The trick with frozen foods - even in fully mature adult tanks, is to make sure ANY uneaten particles after 3minutes are removed from the tank, this is why in the fry's first few weeks of life i was doing at least two 20% water changes a day. I'm sure you're next batch of fry will be better off with your preperation
I can't really say much more than sorry about the loss of your fry, i've lost a few other the last two weeks so i know how it feels

Dan