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PostPosted: Sun Jul 08, 2007 8:34 pm 
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Fishkeeper

Joined: Mon Dec 11, 2006 8:11 pm
Posts: 194
Location: Somerville
Hey folks!

I thought I was pretty darn good at sexing bettas, but we just got a big shipment of supposedly-female bettas in at Skipton's and I'm convinced a handful of them are definitely males, about 50% definitely females (nice, big ovipositor visible), and the rest are totally stumping me! Many have richer colors and longer pectoral fins, but a very small and slight egg-spot!

To the experienced betta-breeders out there: Are there other definitive characteristics besides the ovipositor and how can I be sure what I have? I want to be sure we're not deceiving any of our customers!

Thanks!
~Khrysti~

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PostPosted: Mon Jul 09, 2007 6:37 pm 
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BAS Treasurer
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Joined: Sun Jul 16, 2006 10:52 pm
Posts: 503
Location: Boston
Well, here's another way. It's not always foolproof because some females aren't long or short, but males will have longer pelvic fins than females.

is it possible to have hermaphroditic bettas?

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PostPosted: Mon Jul 09, 2007 7:42 pm 
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Fishkeeper

Joined: Fri Mar 17, 2006 8:32 am
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Location: Shirley, MA
Even ovipositors aren't a sure sign...some males also have a white ovipositor-like spot.

I've not heard any reports of hermaphroditic bettas, but there are certainly males that hide it well.

If they've got richer colors and longer pectorals, it's probably a good bet that they're male. I'd separate them.


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PostPosted: Mon Jul 09, 2007 8:28 pm 
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Fishkeeper

Joined: Mon Dec 11, 2006 8:11 pm
Posts: 194
Location: Somerville
Thanks Nicole! We keep ALL of our bettas separated all the time anyway, which is another reason it's harder to tell...

Thanks for the reassurance that my instincts were right. :-D

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PostPosted: Tue Jul 10, 2007 1:22 am 
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Heres another try... Put them all into cups, put them side by side and see which ones flare at each other :)

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PostPosted: Tue Jul 10, 2007 11:04 am 
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Fishkeeper

Joined: Mon Dec 11, 2006 8:11 pm
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Location: Somerville
Sometimes that works - but it's a little time-intensive for the nearly 200 bettas we have right now and half the time they don't care much!

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PostPosted: Sat Feb 21, 2009 1:43 am 
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Fishkeeper

Joined: Tue Nov 20, 2007 11:49 am
Posts: 9
Location: Oklahoma
Bettas are not hermaphroditic but females can change into males.

In one reported case the female spawned and produced fry and several months later turned into a male and spawned again and produced fry.

Females have also been known to make nests and tend fry as well.

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