Where did that fry come from???

jyanagi

AC Members
Sep 5, 2006
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Hi All,

Today, while doing a water change, I found a tiny, very tiny little fish fry swimming in there. It is so small, I never would have seen it in the tank. I'm a little stumped whose baby it might be. Some background information.

About 3 months ago, I entered this hobby with a 10g tank with 3 guppies (2 female, 1 male) and 4 zebra danios. 29 days ago, female guppy #1 gave birth. I ran out and got a 28g tank. I transferred most to this new tank, so, now, the 28g has 2 female guppies, 4 zebra danios, and 5 four-week old female guppy youngsters.

2 days ago, female guppy #2 gave birth. The danios have eaten most of these fry although there are a few still in there. After seeing more than 80 guppy fry being birthed over the past month, I'm quite familiar with the size of newborn guppies. But, during the water change today, I found a tiny, tiny fish, maybe only 1/10 the size of the newborn guppy fry. I'm sure it's a fish, but it doesn't entirely look like the others, although it's so small, it's hard to be sure. It also doesn't act like ths others. I moved it into a plastic cup, and it dropped to the ground - I was sure it was dead until it moved maybe 10 minutes later. When it moves, it doesn't move the same way the guppy fry move, but in very short, stuttering movements.

It's not larvae of some kind, it is absolutely a fish. Just incredibly tiny.

The only things it can be are: 1. guppy fry, 2. zebra danio fry. I never saw any danio eggs, but then I wouldn't be certain of what they looked like. I suppose some could have fallen between pieces of gravel, and hence hatched. Does this fry fit what a danio would?

As for guppy fry, my doubts are above, but I'll also say that female #1 is about to give birth again. Still, it's way smaller than any guppy fry I have ever seen. Is it possible to maybe be a preemie or do guppies occasionally give birth to different sized fry? Let's put it this way, it is so small that it could easily swim out the sides of a plastic breeder trap. I'm not certain that it wouldn't be able to swim through the fibers of a breeder net!

Thank you very much for your thoughts.

John
 
Could be from the Zebra Danios. It doesn't take much to get them to spawn. You wont see eggs because if you can see the eggs then so can the Danios and they eat their eggs.
 
Thanks very much Web Gazelle. I'm 100% sure now that you are right. Female guppy #1 started birthing about an hour after my post, full term normal-sized guppy fry, which threw out the preemie theory.

I also was reading two websites on zebra danios. They seem to imply the fry are very tiny. I guess their eggs must be even tinier. Makes me wonder if I have been vacuuming them up and not realizing.

Thanks again,
 
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