How 2 Sex Danios

[julia298]

Hi

I was wondering if anyone knew how to tell male from female zebra danios.
I have 5 but no idea how many of each sex.

 

[Ethos]

Edit: I stand corrected.

 

[OohFeeshy]

Tis easy, males are slimmer than the females, females are fatter. Its easiest to tell when the females are full of eggs.

 

[The-Wolf]

http/danios.odd-fish.net/danio/SexingBreeding.html

it is easy, females are more rotund when compaired to males
a picture is worth a thousand words

 

[thapsus]

Females are fatter and a bit bigger too. But if danios are very young, it's impossible to tell.




OT: Oohfeeshy, I really like your avatar. I don't know why but it's great.

 

[OohFeeshy]

OT: Oohfeeshy, I really like your avatar. I don't know why but it's great.

Yeah, its from The Last Hero 'Tis Lord Vetinari, an absolutely delightful character who makes a good role model to all small kiddies everywhere

I was looking for the link to your post on that in another thread Wolf, but couldn't be stuffed, so gathered you'd turn up eventually

 

[mikev]

http/danios.odd-fish.net/danio/SexingBreeding.html

it is easy, females are more rotund when compaired to males
a picture is worth a thousand words

Could you clarify this a bit?

Firstly, does this apply to Giants? On your web site it says :

This is not the case with Gaints, Benagals & Moustached, they can only be sexed when the female is egg-laden.

Gaints==Giants, right?

There are seven Giants in my tank, all about of the same length (2in). Three of them are slim (about 1/4-1/5" high); three others have much bulkier (and rounded) front half (perhaps close to 1/2" high). The same pattern (heavier "front") seems to be shown on your picture. I therefore assume that the first three are males, the last three females.

The last fish is a problem, since it has no visible "large chest", but it is much higher than the other three (alleged) males. How does one know?

(Actually, I've chosen them in the lfs this way: 3 likely males, 3 likely females, and one puzzle; either way it is a balanced group).


One more question, if you don't mind: does this apply to Rasboras too?

Thanks.

PS. I'm sorry for describing instead of posting images: It appears that my camera is not capable of making a decent photo of G.D.'s. -- they move too fast.

 

[The-Wolf]

Thanks for pointing out the slight misspelling, I'll rectify that next update.

Giant danios are hard to sex and IME only when she is ready to spawn can you be 100% posative. I have several males that are as you describe. IE "heavier front"

I'm no expert on rasboras so I couldn't say if the same applys.
however with most egglayers females tend to be fuller figured than males.

 

[mikev]

Thanks for pointing out the slight misspelling, I'll rectify that next update.

Your web site is a real nice resource -- thanks for putting it together -- and your descriptions are also the reason why I decided on having Danios in the new tank

I hope you don't mind me mentioning that the biggest problem with your site is not the misspelling but your use of absolute positioning: for some readers of your page text will overlap in a bad way (depends on the browser).

Giant danios are hard to sex and IME only when she is ready to spawn can you be 100% posative. I have several males that are as you describe. IE "heavier front"

Oh well. I guess I'll have to wait till they double in size.

Is there any significance to the bright orange bottom fin? It seems that those that have bright orange are mostly female-shaped and also more aggressive (only in the sense of chasing other GD's).

I'm no expert on rasboras so I couldn't say if the same applys.
however with most egglayers females tend to be fuller figured than males.

 

[The-Wolf]

Is there any significance to the bright orange bottom fin?

I have only seen the orange fin appear on a few speciamines.
not just on Giants but also on D.Rerio and D.sp Burma.
I can not make a judgement call on wether or not it is male/female
related or wether it is just a sign that water params are perfect, or
some other factor.

 

[mikev]

Not water or tank conditions, I'm sure: those that were orange in the store, are still orange, and their water conditions are quite different from mine.

Either sex, or a variation. They are prettier with orange, however.

If I may ask: one more question: just how fast do they grow? (I'm beginning to realize why your web site said 48" length...darn.)

 

[Lynden]

The females are more round, but it does not really matter, as they breed so easily. If you buy 4 individuals, you are pretty much 100% sure of getting at least one male and female. It happens to me all the time. Also, when it comes to breeding, danios screw faster than rabbits, pretty soon the tank will be crawling with babies.