Help breeding EBJD's

i think u need 1 regular female (non ebjd) and a male ebjd to actually breed or vice versa from wat i heard

okay. . . . basic high school biology, with a twist.

regular dempseys have two copies of the color gene. both copies, let's say, are called B.
blue-gene dempseys, which carry the electric blue gene but are colored normally, have Bb (b being the recessive light-colored gene).
ebjd's carry two copies of the b gene - bb - and therefore express the color.

theoretically, it would make sense to breed two ebjd's together and get all eb fry. the "twist" is that the blue gene carries some form of genetic weakness with it, which results in high mortality of resulting fry. few, if any, will survive. this is similar to the problems in the past with the DD (double dark) gene that produces pure black angelfish.

due to the weakness when breeding two ebjd's, a more effective but time-consuming route is to breed blue gene jd's with each other or with an electric blue. while there will be a lower % of eb fry in each batch, they will overall be more likely to survive.

Breeding a standard JD with an EBJD will result in 100% Blue Gene fry.
Breeding a BGJD with another BGJD will potentially result in 25% standard jd, 50% BGJD, and 25% EBJD.
Breeding a BGJD with an EBJD will result in 50% BG and 50% EB.

Keep in mind that the Punnett Square kind of genetic diagramming is an estimation if what could/should happen, everything being equal. It is not a guarantee of what will actually happen.

You can breed blue x blue and get full blue off spring.

Actually, you need a blue gene male period, and either a regular female or blue female. Reason is the male must posses the blue gene no matter what.

No matter who you breed the Blue Gene Male with it will take up to 2-3 times before you get any EBJD's in the fry. After that your mix will be roughly 50/50 EBJD's, but all the regulars in the fry will also carry the Blue Gene in them, and they can produce EBJD fry down the line.

As for breeding size, it's the same as normal JD's at round 4" however most males will not try to breed until they reach 6".


Now you ask how do I know this, well the Blue Gene Male I have I got from a breeder friend of mine, who has been breeding EBJD's for the last couple years. His main pair are Blue Gene male, and regular Female, and his fry batches are roughly 50/50 mix, and the regular fry from the batch have the bg in them, as well as the EBJD fry.

not quite Mike. wataugachicken is bang on.

EBJD x JD = BGJD ( regular looking but carry the Blue Gene)

EBJD x BGJD = 50% EBJD, 50% BGJD

BGJD x BGJD - 25% EBJD, 25% JD, 50% BGJD

The sexes do not matter. Most people use a Male EBJD but there is someone who currently is using a female EBJD in his breeding program.

As wataugachicken said, breeding EBJD x EBJD would give 100% EBJD but no one has ever been able to do this. Some have had spawns but the fry always die after a few days of free swimming. Maybe as the EBJD morph gets stronger, it may be possible.