Sexing Electric Blue Jack Dempseys

[FriedFlowerHornFillet]

sterility is the issue
half is usually better than none

 

[atmetoyer]

sterility is the issue
half is usually better than none

yeah you get half ebjd when you bred ebjd to blue gene jack dempsey.

 

[YankeeJack]

I have to wait to have them pair off before I can sex them.

 

[ShadowP]

Actually the best of the best ways to breed the EBJD is to do the following:

EBJD(GP1) X WTJD(GP1) = 100% ebJD(GP1)

And Simultaneously:
EBJD(GP2) X WTJD(GP2) = 100% ebJD(GP2)

Then cross:
EBJD(GP1) X ebJD(GP2) = 50% EBJD(GP1+2) & 50% ebJD(GP1+2)
And Simultaneously:
EBJD(GP2) X ebJD(GP1) = 50% EBJD(GP2+1) & 50% ebJD(GP2+1)

The result... two breeding pairs of EBJD X ebJD with strong genetic diversity and highest possible yield of EBJD young (excluding the rare EBJD X EBJD with 100% nondeformed viable fry).

 

[blue fish]

Maybe this will help. The darker mobrilliantlyy colored fish is the male. The more grey-blue fish is the female, but note that the lowe portion of the operculum is still more intense blue. But as usual, there are still no absolutes. Note the colorof same female about 4 months later Iin the POTM contest April 2015. Huge difference!!!
View attachment 1071930View attachment 1071931

I agree with shadowp, been breeding them for over 2 years and the females are less briallant than the males. That being said you still have to wait for the colors to develop with age. From my experience females are kind of rare. Good luck and try to bring in as much genetic diversity as possible.

 

[ShadowP]

Good luck and try to bring in as much genetic diversity as possible.

Working on that... see recent post in "post your female jack dempsey pictures"
and sorry, but the answer is no... I will not reveal how I paired them safely. There are actually about 250 fry still with them. The rest of about 600 have been used to bring dwarf puffers and dwarf neon blue rainbows into spawning condition. I plan on keeping 24 for breeding stock to pick a male from for my off-the-hook female EBJD

 

[ShadowP]

Breed an EBJD male to a regular Jack female for best results.

You mean like this? She's only 3" long. He's 7 1/2" long and about 15 times her size!
Oh the power of love.... Hehe...

Breed an EBJD male to a regular Jack female for best results.

 

[FriedFlowerHornFillet]

I find the real problem with pairing JD's is actually female aggression. LOL My female is all ready too big. If I get a larger tank I might try again with a smaller male Jag.

 

[YankeeJack]

That Larger Male x Smaller Female pairing can work. In my main pair, the male is 3x larger than the female.

 

[ShadowP]

That Larger Male x Smaller Female pairing can work. In my main pair, the male is 3x larger than the female.

Well here's a top view (taken the day they hatched) to help you see their size difference. He's about 15 times bigger (L x H x W) verses hers.