Guppys

[StiX]

Hey, i bred my gupps, I have about 20ish, theyr 2 weeks old and they all seem to be females? theyr about just over 1/2 a cm. Do they sometimes have all same sex broods ? or are they too young to tell their sex and i'm seeing things ? lol

Thanks

 

[Gibbo]

Patience Skywalker!!

Too small to tell at a guess. At that age they may be sexually dimorphic, ie. no sex to speak of. Sometimes environmental factors can determine the sex (temperature etc) in time. I'm no livebearer specialist so I bet William or somebody will give you better advice!

 

[StiX]

Thx m8

Do we have a livebearer expert on board ? lol i dunno

 

[William]

Thx m8

Do we have a livebearer expert on board ? lol i dunno

How could you forget me! !

Same as me I was sure that all mine were females wait till they grow a bit more and you'll see the males developing nicer fins and gonopodiums (sp?)
Its only when they are about 1 inch or so that you can tell for sure B)

 

[StiX]

lol, well at the moment not a gonopodium in site! lol but thanks, i'll wait till afew more weeks till i sex them properly then !

 

[Great Lakes]

Hows it feel to be a daddy?

 

[pondfreak4365]

Gibbo, Earlier you mentioned that environmental factors can determine the sex of guppy fry. Is it temp alone? I only ask because my first batch of fry ended up with 8 males and 3 females. Just had another batch and wondered if I could do something to change the ratio.

Thanks in advance

 

[StiX]

Hey all, theyr about a cm long and plenty big enough to sex, and they all female!

 

[William]

Stickle I guarentee that there are males there! Even after 1cm many develop gonapodiums you wait Its easiest to sex when they are about 1" and that is the earliest size u can sell them to shops.

 

[Macquatic]

Stickle, be patient 1cm = 10mm, 1 inch = 25mm. Mac.

 

[shtinkypuppie]

Actually, pH can be a factor too. High pH (basic water) usually creates a higher female ratio, while low (acidic) pH usually yeilds more females.

 

[pondfreak4365]

Well that makes sense, my tapwater is 7.6! Thanks shtinkypuppie

 

[William]

Actually, pH can be a factor too. High pH (basic water) usually creates a higher female ratio, while low (acidic) pH usually yeilds more females.

Many people have said pH and temperature have an effect on the outcome of the young, I don't doubt this, but being a biologist I'd love to see some research on it and some actual results, are there any factual articles you can point me to?

Thanks a lot B)

 

[gadazobe]

[Actually, pH can be a factor too. High pH (basic water) usually creates a higher female ratio, while low (acidic) pH usually yeilds more females.QUOTE]
If I understand correctly (most probably I don't - no matter if your PH is high or low - you're going to get more females than males

 

[StiX]

My pH is 7.6 , but the babies where born in some1 elses tank and lived there for the first 2 weeks, and i dont have a clue of their water parameters.