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PetFish.Net Forum > Fish Types > Livebearers (Moderators: Morgrid, Mollielover) > Topic: How to determine sex in common livebearers
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Ppulcher
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« on: October 01, 2003, 08:24:23 PM »
These suggestions apply to most common livebearer types (Guppies, Endler's, Swords, Platies & Mollies).
 ?
 Generally, the males tend to be a bit more colorful fish, and are slender bodied. ?Female fish tend to be rounder bodied and larger than male fish.
 ?
 Males will have an adapted anal fin called a gonopodium, while females have a fan-shaped anal fin.
 ?
 The following photo of guppies provided by Jennyzed shows the differences in anal fins between males and females.
 ?
 Thanks, Jennyzed!

* gupps-ed.jpg (4.12 KB, 400x215 - viewed 2333 times.)
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« Reply #1 on: October 01, 2003, 08:26:03 PM »
str82thom provides us with the following illustration to show the differences between male and female livebearers.
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Thanks, str82thom!
 

* fishsexe.jpg (4.75 KB, 96x94 - viewed 2275 times.)
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« Reply #2 on: January 04, 2004, 01:29:09 PM »
thanks alot you are a great help. But now i have a problum what should i do when the female has babies?

Mike
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fish freek
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« Reply #3 on: January 04, 2004, 06:18:15 PM »
you should buy a breeding trap and put the fish in it before it has babies, or you could buy some "fry grass" and put it along the bottom, also males (I'm pretty sure) have an elongation like a little tube on its anal fin.
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« Reply #4 on: January 04, 2004, 07:04:08 PM »
One more question. How do I know when shes pregnant? Can you show some pics of pregnant black mollys?
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« Reply #5 on: January 04, 2004, 07:10:52 PM »
Being she's black, you will not be able to see the gravid spot.  The only way to tell is by her belly.  A pregnant molly will have a bulging belly that gets bigger by the day.  As she is nearing the end of her pregnancy, the belly will take on a more bulged-squarish shape.  
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« Reply #6 on: January 07, 2004, 05:52:39 PM »
Quote from: PPulcher on October 01, 2003, 08:24:23 PM
These suggestions apply to most common livebearer types (Guppies, Endler's, Swords, Platies & Mollies).
 ?
 Generally, the males tend to be a bit more colorful fish, and are slender bodied. ?Female fish tend to be rounder bodied and larger than male fish.
 ?
 Males will have an adapted anal fin called a gonopodium, while females have a fan-shaped anal fin.
 ?
 The following photo of guppies provided by Jennyzed shows the differences in anal fins between males and females.
 ?
 Thanks, Jennyzed!

* Malefemale.GIF (19.61 KB, 582x315 - viewed 2700 times.)
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« Reply #7 on: June 21, 2004, 09:27:06 AM »
Other livebearing fishes don't necessariily have a gonopodium like poeciliids.

Fish like half-beaks (Nomorhamphus celebensis) look a little different.  I don't have much information, but there are photos on the following webpage that illustrate the differences between male and females for this species:  http://livebearers.org/livebearerspg3.htm
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« Reply #8 on: November 18, 2006, 02:24:56 PM »
Illustration of a female and a male molly.

* female and male molly.gif (18.83 KB, 260x250 - viewed 2249 times.)
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