Male and female zebra danios?

What do you think, is one of these zebra danios female and the other male? Or are they both females? I am pretty sure all my glofish thus far are female, and I have one longer finned light colored zebra danio which is definitely male, but the dark zebra danios I am the least certain about.




Btw, I also had mixed feelings about my ability to take good photos tonight. On the one hand I got some great photos, but on the other especially one of the danios was moving uncharacteristically little, and one week after the death of another fish, any uncharacteristic behavior makes me nervous. Here is hoping that there is nothing wrong.

Oh, and here is a close up of one of the danios above. This is the one that was moving around less than usual.

 

Here is one that I am almost certain is male. He is a more long finned variety. Note: he is not a glofish but rather a light colored zebra danio.

 

Generally females are deeper bodied, ( top to bottom) than the males.

 

The bottom fish in the first pic is female, the top may be male and the longfin is male.

 

Soltarianknite, Aha! That is pretty much what I have been suspecting. I hope that the most questionable fish is also male because otherwise my tank would have a total of one male only and otherwise all ladies.

 

With zebras you want an exact mix of 1:1

 

Alas that may not happen in my tank, so some of my female zebra fish may never find their mate.

 

Oh well. I mean, unless you had breeding plans.

 

No, no breeding plans. There is still a chance of more males though since I am planning to get two more danios. However, I find that the danios in the store often are a bit younger and harder to tell gender on - I will try for two males, but since I am not planning on breeding, no big deal, hopefully.

 

Young danios are next to impossible to sex. Not to mention a under fed female looks just like a male. My LFS has adult danios or all kinds. Females and males are easy to tell apart since the ladies are always gravid with eggs.