Hello, my name is Pedro and I'm from Portugal. I'm a beginner in goldfish breeding and I have my first clutch of babies. These babies are the offspring of a fantail mother and an oranda father.
The aquarium where I keep the babies (about 180) is 40cm wide and 30cm deep. The water has a pH of 8.4 and a medium GH. The temperature is around 23 degrees Celsius. I am giving them artemia nauplii 3 times a day.
However, I am having a problem with the fry, which are now 6 days old. Their bellies and intestinal cavity (as you can see in the photo I sent) are very swollen. It looks like a lot of water is getting into the fish. I say water because they do not stay in the air on the surface. Not everyone is in this state, but in a group of 180, there are about 10 or 11 with this problem. And more are always appearing. The aquarium has 30 liters and I change it to 10 liters of new water every day. The water level is 15 cm.
What could be happening? Please help!
Thank you all very much.
This could be "gas bubble disease". Have you temperature or pressure shocked the fish by mistake?
For example, on a commercial goldfish hatchery, I had this happen when feeding live artemia from much cooler artemia culture into a small volume of water for fry. The bubble was instantaneous. I've seen it occur when water is dropped quickly into fry ponds.
It doesn't look like an air bubble to me, because the fry don't float, they can stay in the water column like healthy fry. The water from the company in my area has a pH of 7.8 and is of medium hardness. Every day, about 11 to 20 new fry appear with this problem.
I do almost total water changes twice a day. But with this amount of fry, I do an ammonia analysis and it gives me slight amounts of ammonia. This problem is affecting both the underdeveloped fry and the more developed ones.
I introduce new water through a thin tube (like the ones used for air pumps) and reduce the flow with an air tap. In fact, the water I introduce is at room temperature and the aquarium water is at 23 degrees.
The aquarium takes about 3 to 4 hours to fill completely (remember that there are only 30 liters inside the aquarium). and the maximum height of water inside the aquarium does not exceed 15 to 20 cm. I think that the pressure suffered is not much.
If you prefer, I can send you some new photos or videos of the fry with this problem. When I observe these affected fry, I see that most of them stay still either at the bottom, in the water column or even near the surface (the latter near a corner of the aquarium). But I have also observed that some with this problem try to eat. But in fact, if I look closely, almost all of the fry that have these symptoms do not have stomachs full of food, unlike healthy fry.
Thank you very much for your willingness to help.
It doesn't look like an air bubble to me, because the fry don't float, they can stay in the water column like healthy fry. The water from the company in my area has a pH of 7.8 and is of medium hardness. Every day, about 11 to 20 new fry appear with this problem.
I do almost total water changes twice a day. But with this amount of fry, I do an ammonia analysis and it gives me slight amounts of ammonia. This problem is affecting both the underdeveloped fry and the more developed ones.
I introduce new water through a thin tube (like the ones used for air pumps) and reduce the flow with an air tap. In fact, the water I introduce is at room temperature and the aquarium water is at 23 degrees.
The aquarium takes about 3 to 4 hours to fill completely (remember that there are only 30 liters inside the aquarium). and the maximum height of water inside the aquarium does not exceed 15 to 20 cm. I think that the pressure suffered is not much.
If you prefer, I can send you some new photos or videos of the fry with this problem. When I observe these affected fry, I see that most of them stay still either at the bottom, in the water column or even near the surface (the latter near a corner of the aquarium). But I have also observed that some with this problem try to eat. But in fact, if I look closely, almost all of the fry that have these symptoms do not have stomachs full of food, unlike healthy fry.
Thank you very much for your willingness to help.
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