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How old to sex endlers?


Tom H
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On 9/20/2021 at 7:52 AM, anewbie said:

endlers are one of those species that er appear to change sex over time

I was wondering if I was imagining that. 

 

I have 3 tanks that I swear I only put females in.....

Yet all 3 have now had immaculate conception births.

I seem to be having slightly better luck with putting obvious male endlers in with my zebra danio F4 grow out tank. However, the danios are **not** a fan of the gonopodiums😅

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On 9/20/2021 at 8:52 AM, anewbie said:

endlers are one of those species that er appear to change sex over time

Endler's are known to have what are sometimes termed "sneaker males" - though I've not seen that term used with this species directly.  These are males that look like young/small females, except lacking a gonopodium.  They drive breeders nuts because they pass on these colorless traits.  I'm not sure they are true sneaker males, as I don't know if they fool the dominant males or just people.  I was warned about this when I got my N-Class strain from the breeder. 

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On 9/21/2021 at 5:04 AM, OnlyGenusCaps said:

I was warned about this when I got my N-Class strain from the breeder. 

I was told that breeding in vicinity of predators, within 4 - 6 generations the males would lose color.

Not an albino, just melanin/chromatome (it's late, I may have the wrong words/terms) gene expression would turn off.

 

Sounded like a cool experiment to check out with so-called "mutt feeder guppies".... fast forward 18 months of quarantine, and all the generations of feeder fish in the turtle pond are supporting this theory. 

I pull out ~30 fish, put in a qt, dose for potential parasites, because pond, and wait a few weeks to see how everyone is doing.

While in QT, pull any fish that develops a gonopodium, and place in a male tank. Catch any fry, and return to turtle pond to be sorted later. Separate gravid females and put on other side of divider.

6 definite females, after 5 weeks, excluding the 4 gravid females. I put the 6 [theoretically] virgin females in the 4' tank in my spouse's room.....

4 hours later, we have 12 fish. Obviously, I didn't always get the males separated fast enough. 

No biggie, right?

Except 4 weeks later, I only have 3 females, 3 VERY OBVIOUS MALES, 6 fry a month old, and 30 new tiny fry.....

I'm ready to give up on sexing.....

Spouse is super attached, and doesn't want to get rid of any of the babies, and doesn't want a birth control species (aka schooling fish that will consume fry). Okay. 

Yesterday, the visual reality of the exponential growth of guppies sank in.....

BTW: 2nd generation born out of colorless pairings?

All the males look like wild caught endlers....😳

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