How long until the males make themselves known again?

[Bamf Comics]

I've got a batch of guppies just past the 90 day mark and no one has colored up or had any equipment develop. I would think with 13 at least half would turn male. What's the norm again, it's been a few years and I'm running a little cooler than I used to so I'm wondering if that may be delaying things at 75 degrees instead of at 78?

 

[Colin_T]

Post pictures of them.
How big are they now?
How often do you feed them and what are you feeding them?
How often are you doing water changes and how much do you change?

If they are fed well, given lots of water changes and have warm water, you should be able to sex them at 2-3 months of age, usually 2. With the cooler water you have it's probably 3 months before they can be sexed. They should be an inch in length (body size not including tail) at 3 months.

The tail doesn't get full size or full colour until some months later and it might be 6 months before they have a full sized colourful tail. You should have some colour in the tail at 3 months though.

 

[Bamf Comics]

They're not in a tank with a light suitable for great pictures. I moved them to one of the arrival tanks with HOB to grow them out and sex them last week from their tubs. Feeding is always 4 to 6 times a day when I feed the rest of the babies and young guppies and platies. They're right at the 1" size mark right now. I'll probably give them another month before deciding anything.

The mothers were two with large bodies, a bit of yellow on the tail and red on the tail from wholesale mixed stock. I put a gorgeous male with a yellow and red tail in with all the female guppies for over a month. I moved the two females to the tub, the male to a 15 with sailfin plecos and the other males and disaster struck.

The tank they came out of came down with some ick like horror visible the next day. I quickly lost all the clown loaches from that tank and all but two of the females. The tank I moved the male to lost all the male guppies and all dozen marble sailfin plecos before the meds got here. The females in the tub, one had babies the night I moved her, they both came down with the same crap the other tanks got, the other female had babies in less than a week and then I lost both females and most of the babies even seeing the babies with it. These are the 13 survivors. I was hoping to pull a trio of the most spectacular to play with more breeding and be able to sell the rest but so far they all appear to be female and not likely to be in demand to customers.

If they don't show something in the next month I've got some choices. I've got 5 males with names scattered about. I could drop 1 in or break them up into as many as 4 more tubs to see if we can come up with something spectacular in generation 3. The males that aren't really needed for anything else are Blue Grass, Purple Dragon, Galaxy Blue Tails (which show as almost solid black in most viewing looks), Albino Blue Topaz Ribbons, Albino Full Red BDS Halfmoon and by the time another 30 days passes I should have two to four more colors with names to select from.

 

[GaryE]

I don't know with the varieties you have, but I have had wild type guppies take up the 5 months before they suddenly transformed.

 

[Colin_T]

Just wait for @emeraldking to see the thread and we will get a more positive time frame.

 

[emeraldking]

Hi,
A batch of newborns can be of one sex for sure. So, that's not something weird. A female won't change into a male by turning up the temperature. If you do breed guppies and you want more males in the sex ratio of newborns, you can raise the temperature during the whole pregnancy. And not just halfway, at the end or even after. If you breed them at lower temperatures, more females will be born. It's not that it always works but it's got to do with a sudden increase or decrease that is used during the whole pregnancy. For if you're keeping the temperature steady at higher or lower rates, the sex ratio should be about 50/50 - 60/40 - 40/60.
The determination of the sex itself should already be possible after a couple of days. But it needs a trained eye to be able to do this at an early age. Like most serious guppy breeders, also I do it that way.

Showing color, pattern or even further development of the fins needs time. And that time differs per individual specimen. It depends on genetics, water parameters, food and temperature. Even the water flow can be of influence.