Tropical Fish Keeping - Aquarium fish care and resources

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-   -   Are the odds against me, or am I not giving it long enough? (Livebearers) (http://www.tropicalfishkeeping.com/fish-breeding/odds-against-me-am-i-not-35698/)

kald 01-21-2010 11:30 AM

Are the odds against me, or am I not giving it long enough? (Livebearers)
 
My platys (one mother died, RIP :( ) and a female swordtail gave birth back in early October, around the 8th I think. They've been steadily producing fry since then.

My question is when can I gender them? The reason I ask is because, by the looks of it, all 15 fry or so are female. About 5 fry are bigger than the parents already, yet all are "female". No fry show signs of a gonopodium, which surprises me after this amount of time. How long can it take for a platy/sword to grow the gonopodium?

Side note: I hybridized a blue tuxedo platy with a red high fin swordtail and the result is great! Swordtail body with black tuxedo, red body and aqua/blue shimmer all over. Beautiful. I want to try to continue breeding swordtails with the blue colouring. Any tips?

La Reina 01-22-2010 12:23 PM

The coloration sounds cool, but I'm not sure if crossbred platy/swordtails can reproduce... Is this true?

1stAquarium 01-24-2010 02:28 PM

I have had loads of guppy fry since getting my various guppies and I have also noticed that the vast majority of the fry are female. I though maybe this was something to do with species survival? As in, one male can impregnate lots of females so less males are needed? Or maybe it's just coincidence! Lol :)
Your hybrids sound amazing!

kald 01-26-2010 12:44 AM

Quote:

Originally Posted by La Reina (Post 310728)
The coloration sounds cool, but I'm not sure if crossbred platy/swordtails can reproduce... Is this true?


As far as I know, they are fully fertile. I believe that the majority of fish out there now are not really "platy" or "swordtails" but merely a genetic dump of both. I wouldn't class my hybrids as either. I call them "plalleri"; "Platy" and "Helleri". :)

kald 01-27-2010 01:19 PM

Update.. 5 day old fry are getting colour already... they all have 3 large black stripes like a zebra on their sides and the fry are elongated. Looks interesting, I'll get pics as soon as they grow big enough.

eileen 01-27-2010 02:07 PM

Sorry to hear about your fish passing. Livebearers do not have a long lifespan that's why they reproduce so fast in fry every month. I would say if she had 8 drops with no rest in between fry that she had done her job well.

As for the Platy and swordtail they are both from the same speices so they can interbreed. I know this because I have a book on Platies/Swordtails.

As for Platy sexing them will take awhile as the Platy will all look like females and sometimes can take up to 6-9 months to develop. The late developing males will look like females with a fuller body type like a female, The earlier ones will not. Sometimes you hear about someone saying his fish changed sex but it is just a late developing male. I had this happen to some Gold dust mollies that I thought were all female them a few months down the line they turned to males. Just late developers.

Did you know that if you want more males then female the water temp. set at a lower temp 70 or below will produce more males, Higher temps. produce more females. This is true because I always have my tanks set lower and I do get more males born. Sometimes in the summer it is hard to regulate the water temps. In the summer I just do without a heater( Unplug it) on the really warm days of summer in the house.

La Reina 01-27-2010 04:20 PM

Quote:

Originally Posted by eileen (Post 313957)

Did you know that if you want more males then female the water temp. set at a lower temp 70 or below will produce more males, Higher temps. produce more females. This is true because I always have my tanks set lower and I do get more males born. Sometimes in the summer it is hard to regulate the water temps. In the summer I just do without a heater( Unplug it) on the really warm days of summer in the house.

Crocodiles are like that too with their eggs. I think aligators too..

Kelso 01-28-2010 12:37 AM

Quote:

Originally Posted by La Reina (Post 314037)
Crocodiles are like that too with their eggs. I think aligators too..

Yup! That's how it works for them too...If the temperature inside the nest is below 31.7 C (89.1 F), or above 34.5 C (94.1 F), the offspring will be female. Males can only be born if the temperature is within that narrow 5-degree range. That's for Nile Crocs...it differs for each crocodilian species, but you get the idea!

La Reina 01-28-2010 11:06 AM

Quote:

Originally Posted by eileen (Post 313957)
Sorry to hear about your fish passing. Livebearers do not have a long lifespan that's why they reproduce so fast in fry every month. I would say if she had 8 drops with no rest in between fry that she had done her job well.

.

What is the estimated lifespan for platies? I've heard three years in captivity and one year in the wild. Of course, we can never be sure how old our store bought fish are.

eileen 01-28-2010 12:20 PM

The average lifespan of a platy is 3-5 yrs. is the estimate with proper care. I'm sure that with good care they can live longer. I would think that a female might have a shorter lifespan.She is overstressed by the males chasing her and having babies every month of her life that's enough to shorten ones lifespan. More females to 1 male is the best as to not stress out the females. You can always put the females in their own tank and have the males in their own tank. I did this to keep the stress level down and scooped up the babies and had them grow in their own tank.


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