This is a first for me - fry with NO males present for MONTHS!
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This is a first for me - fry with NO males present for MONTHS!

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This is a first for me - fry with NO males present for MONTHS!
Old 12-02-2012, 01:09 AM   #1
 
This is a first for me - fry with NO males present for MONTHS!

Hi,

I was wondering if anyone else has ever heard of this happening. It has me baffled.

I moved two very young guppy females into a tank that had only had shrimp and dwarf cory catfish in it previously, to keep a light fish load in it while I moved some tanks around. This tank has basically been in a holding pattern, and for much longer than I anticipated. It is planted with crypts and some Hydrocotyle, and is a Walstad-style planted tank.

Anyhow, these were VERY young female guppies, and this was MORE than 6 months ago. Neither has changed into a male (yeah, I've had that happen where a young female will "become" male if no males are present) and now suddenly there are two newborn fry swimming around with them! Both adults are still female in appearance, but look like they might just drop some more fry.

This is odd. Can they "hold" genetic material from a male for 6-7 months? I didn't think that was possible, and really, both females were so young when I brought them over that I figured they had not bred yet.

Also, will these fry be "normal"? I'm actually a bit curious to see if these develop into males or females. My guess would be they'll be male.

Thanks very much!
-Jane

Last edited by Jane of Upton; 12-02-2012 at 01:11 AM..
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Old 12-02-2012, 01:20 AM   #2
 
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Quote:
Originally Posted by Jane of Upton View Post
Hi,

I was wondering if anyone else has ever heard of this happening. It has me baffled.

I moved two very young guppy females into a tank that had only had shrimp and dwarf cory catfish in it previously, to keep a light fish load in it while I moved some tanks around. This tank has basically been in a holding pattern, and for much longer than I anticipated. It is planted with crypts and some Hydrocotyle, and is a Walstad-style planted tank.

Anyhow, these were VERY young female guppies, and this was MORE than 6 months ago. Neither has changed into a male (yeah, I've had that happen where a young female will "become" male if no males are present) and now suddenly there are two newborn fry swimming around with them! Both adults are still female in appearance, but look like they might just drop some more fry.

This is odd. Can they "hold" genetic material from a male for 6-7 months? I didn't think that was possible, and really, both females were so young when I brought them over that I figured they had not bred yet.

Also, will these fry be "normal"? I'm actually a bit curious to see if these develop into males or females. My guess would be they'll be male.

Thanks very much!
-Jane
The interesting thing about the female guppy, is yes, she can indeed hold the sperm and use it at a later date. If this is her first batch without a male in the tank then it's possible you will see her produce more batches than that.

Hope this helps!
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Old 12-02-2012, 01:27 AM   #3
 
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Originally Posted by AndrewM21 View Post
The interesting thing about the female guppy, is yes, she can indeed hold the sperm and use it at a later date. If this is her first batch without a male in the tank then it's possible you will see her produce more batches than that.

Hope this helps!
WOW...... that long? And one of them is having her first batch just now? That's amazing. I thought sure I'd insured there wouldn't be any fry from those gals. Sheesh, sneaky!

And thanks for the lightning-fast reply!

-Jane
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Old 12-08-2012, 04:44 PM   #4
 
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They can even reserve sperm while they're pregnant, and go through multiple pregnancies with the stored sperm!
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Old 12-10-2012, 01:01 PM   #5
 
Chance are, she's held the sperm for all of the 6 months, and while its not common for them to hold it for that long, it's very possible.
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