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Old 11-10-2011, 05:29 PM   #1
dollfish
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Exclamation Male or Female Guppy???

I bought a few male guppy fish, but I think one of them may be a female... Can someone please take a look at my picture and let me know what they think?

http://lockerz.com/s/153285397

Sorry, the picture quality isn't that great... the guppy I think may be female is the one on the top.

Any help would be much appreciated
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Old 11-10-2011, 05:38 PM   #2
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Too difficult to tell definitively. Take a look at this crude sketch I found online. It actually does a decent job of showing the difference.

You look at the anal fin of the fish. If it is thin, then it is a male (the fin is called a gonopodium then). If it looks like a normal fin, then it is a female.
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Old 11-10-2011, 05:50 PM   #3
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Thanks I will have to take a close look at it... Is it common for male guppy fish to look so different? Also, my male guppy has been nipping at this one's anal fin area... what does that mean?
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Old 11-10-2011, 05:55 PM   #4
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Guppies will breed like its nobody's business. If the other one is a female, its usually a breeding habit.
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Old 11-10-2011, 05:59 PM   #5
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Thanks for the info
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Old 11-10-2011, 06:43 PM   #6
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Yours are males. They're pretty too!
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Old 11-10-2011, 06:48 PM   #7
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Yay! How can you tell that its male? I'd like to know for future reference
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Old 11-10-2011, 07:02 PM   #8
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Guppies will breed like its nobody's business.

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Old 11-10-2011, 08:43 PM   #9
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I'm actually leaning toward female for the top, right one.

Here are better pictures that I stole from this site.

Male guppy

-Brighter colors
-Larger tail
-Gonopodium (thin pointy anal fin)
-Thiner body

Female guppy

-Less bright colors
-Smaller tail
-Sail shaped anal fin (no gonopodium)
-Fatter, less streamline body
-Gravid spot may or may not be visible

Again, the gonopodium is the only surefire way to determine gender, but these other characteristics should help in identifying gender in guppies
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Last edited by bmlbytes; 11-10-2011 at 08:53 PM.
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Old 11-10-2011, 09:50 PM   #10
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Originally Posted by dollfish View Post
Thanks I will have to take a close look at it... Is it common for male guppy fish to look so different? Also, my male guppy has been nipping at this one's anal fin area... what does that mean?
Secondary sexual characteristics are very obvious in guppies. A male guppy generally has the most vivid colors, have a caudal fin that is significantly more fanned, and will be a bit smaller in body than the female. The female will often be silver in wild guppies. In fancy guppy females, although they do get some of the color of the males, they will have less vivid coloration and have a large portion of their body plain, often silver like the wild guppy.

Look at the pictures posted by bmlbytes. The female is not as colorful as the male, has a caudal fin that is less fanned, and although the photos are not the same scale, guaranteed the female is larger than the male by a good 20-30%.

Now look at your photo. The same differences can be seen, so the photo evidence supports the top guppy being female and the bottom fish male.

These secondary sexual characteristics are very pronounced in guppies, but yes/no on the gonopodium is still the best indicator, as bmlbytes already said.

As for the second question, the male "nipping" at the females vent is typical hit-and-run mating behavior. I've seen slow motion video of guppies mating. The actual sexual act is extremely fast. (I speculate that the male uses his lips to locate the target, aka the vent) He hits the vent with his gonopodium very quickly, on the order of milliseconds.

This will happen hundreds of times a day, which is why it is recommended to have more females than males. One female in a tank of males will be harassed relentlessly and may even die from the stress. You should put plenty of hiding places for her in that tank.
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Old 11-11-2011, 05:12 AM   #11
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LOok at the anal fins. Males have gonopodiums (sure i spelled that wrong) . They are not spread out like a females, which look a fan. But they are held back and pointed. They kinda look sharp. Females usually don't have bright vibrent colors on their tails or body, but sometimes you can find some really nice ones. Females don't usually have color on their bodies. But they can. The normal colors are blond, grey, or just plain. Colors can be misleading, so i wouldn't charge it by that. Females will also have a gravid spot. On some, harder to see.

Im positive yours are males, the picture is a bit hard to tell, but im sure of it.
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Old 11-11-2011, 10:51 AM   #12
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The top one does not indicate male at all. You can't even see the anal fin, its a dull color, it is larger and rounder. Females will not always have a gravid spot. They will only have a gravid spot if they are gravid. Females can display bright colors, but usually only in the tail. Without clearer images, I am fairly certain that it is a female.
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Old 11-11-2011, 12:07 PM   #13
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I see one male and one female.

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Old 11-11-2011, 01:57 PM   #14
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Hmmm, can you give us another picture???
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Old 11-11-2011, 03:54 PM   #15
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Originally Posted by ZebraDanio12 View Post
Hmmm, can you give us another picture???
*I* can't. They aren't my fish.
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