Blue Jack Dempsey - Breeding Pair
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I beleive that I got luck and got good,new bloodlines. Unlike many people I've heard whohave tolb me how their EBJDs aren't at all interested in spawning, mine first spawned at about 1 1/2 years old and if I leave them together, they'll spawn every month... providing I remove fry. 
If not, the female starts eating them at about 3-4 weeks. And wouldn't you know... The Blues are much easier for her to catch.
I caught her eating them once and immediately removed fry; my blue percentages dropped from 50% to 10% on that spawn.
I now renove fry at 7-10 days from 1st day free swimming. They become free swimming at 10 days after eggs are laid.
Randy
If not, the female starts eating them at about 3-4 weeks. And wouldn't you know... The Blues are much easier for her to catch.I caught her eating them once and immediately removed fry; my blue percentages dropped from 50% to 10% on that spawn.
I now renove fry at 7-10 days from 1st day free swimming. They become free swimming at 10 days after eggs are laid.
Randy
Lemme esplain....
No, lemme summarize...
To produce EBJDs...
1) Get an EBJD and raise it up, or buy an adult. Odds are it will be a male cause there are just a lot more males available.
2) Get a regular JD female... cause you probably have a male Blue.
3) Put em in a tank, I use 40 gallons for my breeding tanks. Feed them well/condition them. At this size and age, about 12-14 months old they get Myssis, Brine shrimp, chopped plankton, and maybe a few high quality pellets. Once the female is really sucking up to your studdly male, remove pretty much all other fish from the tank, or they will likely be killed, or be beaten so badly they'll wish they were dead.... they are Dempseys and the BG especially acts like one.
Be sure to provide rocks, clay pots, or pvc for them to spawn on. cause they will...
4) Now that you have eggs, there's nothing for you to do, but press your nose against the glass to keep your fish intertained...
In 3 days the eggs should hatch; in 7 more you will have a batch of 100% BJGDs... Not a single blue one, but every one of them will carry the gene for blue.
5) Raise a fewof these BGJDs to maturity, about 12-14 months, cause unless you get real luck, or have a whole lotta $$$ to spend on BGJDs you aint gonna find any for sale.
6)Repeat steps 3 and 4, but this time replace the regular JD with your precious BGJD. 50% of the resultant fry will be EBJDs the rest will be 2nd generation BGJDs.
And that's all there is to it...
besides everything else.
Randy
No, lemme summarize...
To produce EBJDs...
1) Get an EBJD and raise it up, or buy an adult. Odds are it will be a male cause there are just a lot more males available.
2) Get a regular JD female... cause you probably have a male Blue.
3) Put em in a tank, I use 40 gallons for my breeding tanks. Feed them well/condition them. At this size and age, about 12-14 months old they get Myssis, Brine shrimp, chopped plankton, and maybe a few high quality pellets. Once the female is really sucking up to your studdly male, remove pretty much all other fish from the tank, or they will likely be killed, or be beaten so badly they'll wish they were dead.... they are Dempseys and the BG especially acts like one.
Be sure to provide rocks, clay pots, or pvc for them to spawn on. cause they will...
4) Now that you have eggs, there's nothing for you to do, but press your nose against the glass to keep your fish intertained...
In 3 days the eggs should hatch; in 7 more you will have a batch of 100% BJGDs... Not a single blue one, but every one of them will carry the gene for blue.
5) Raise a fewof these BGJDs to maturity, about 12-14 months, cause unless you get real luck, or have a whole lotta $$$ to spend on BGJDs you aint gonna find any for sale.
6)Repeat steps 3 and 4, but this time replace the regular JD with your precious BGJD. 50% of the resultant fry will be EBJDs the rest will be 2nd generation BGJDs.
And that's all there is to it...
besides everything else.Randy
That was sooooooooo helpful thank you very much.. How many gallons would be ideal to take this Mission on? 
To clarify...
The photo above with all the little loops around fry are colored blue to indicate EBJD fry, while the black loops indicat BGJDs.
These fry were 4 weeks old when I took the photo and I can distinguish them 100% at this age. This is also the age when I separate them because about 90-95% of the EBJD fry aren't aggressive enough eaters to compete with their BGJD siblings. I this is likely part of the reason they don't appear in nature/the wild. If I leave them all together for as long as 8 weeks, most of the EBJDs will be 1/2 the size of the BGJDs and really skinny. When seperated, the EBJDs grow very well to, but still not as fast as the BGJDs. But there seem to be about 5% of the EBJDs that are as aggressive as, and grow as fast as the BGJDs. I think this 5% is were the future, stronger strains of EBJDs will come from.
Randy
The photo above with all the little loops around fry are colored blue to indicate EBJD fry, while the black loops indicat BGJDs.
These fry were 4 weeks old when I took the photo and I can distinguish them 100% at this age. This is also the age when I separate them because about 90-95% of the EBJD fry aren't aggressive enough eaters to compete with their BGJD siblings. I this is likely part of the reason they don't appear in nature/the wild. If I leave them all together for as long as 8 weeks, most of the EBJDs will be 1/2 the size of the BGJDs and really skinny. When seperated, the EBJDs grow very well to, but still not as fast as the BGJDs. But there seem to be about 5% of the EBJDs that are as aggressive as, and grow as fast as the BGJDs. I think this 5% is were the future, stronger strains of EBJDs will come from.
Randy
As a full-time student... Traditional Chinese Medicine... living in someone elses house, I have limited space, so...
I started with one forty gallon tank, which I raised 5 EBJDs in for more than a year. Then I picked up another 40 to put everything but the pair in. I bought my original JD female at the lfs as a beautiful dominant, young adult. They were all together for about 6 weeks. As soon as I took all the other fish out, they spawned within 3 days.
I now have four 40-gallon tanks, a 20-gal, and a couple of 10s
I started with one forty gallon tank, which I raised 5 EBJDs in for more than a year. Then I picked up another 40 to put everything but the pair in. I bought my original JD female at the lfs as a beautiful dominant, young adult. They were all together for about 6 weeks. As soon as I took all the other fish out, they spawned within 3 days.
I now have four 40-gallon tanks, a 20-gal, and a couple of 10s
The photo above on this page of the pair in the flower pot was my first pair's first spawn. He was about 6". Now, more than a year later, he's nearly 9"
How often do they mate? and how many survive out of 300 fry? also are 2nd generation BGJD less productive then the 1st generation BGJD? and what tank size would be necessary, i have my EBJD in a 90 gallon right now iwth 6 other tankmates, a ray and some Knifefish...hes about 5" and 2 years old..
When I've left them together, they spawn every 4-5 weeks. I seprate them now.... too many fryAquataHolic420;545035;545035 said:
Depending on how well you feed them and the water quality, they could all survive. I was maticulous with one large spawn for the first 4 weeks so I could get acurate percentages of EBJD:BGJD it was like... 350:380 at 4 weeks. I lost very few in and behind the filter. That's almost exactly 50/50%
I think that genetically, 1st generation BGJDs will be stronger than 2nd generation. Out of several hundred fry, I've only seen 2-3 gimpy tailed/bent back EBJDs, which could have been do to trauma at a very young age; regardless, that's nothing...
I bought my original breding male at 1 1/2" almost 3 years ago and he's almost 9" now
My second breeding male was 1 1/2" when I bought him about 1 1/2 years ago, he's now about 7 1/2".
I think my fry grow pretty fast and they take 6 months to get to 1 1/2" size.
I usually do regular water changes, but my breeders with 12 day old fry right now haven't had a water change for well over a month...
None of my fish have ever been in anything more than 40-gallons, and they are usually crowded, but with good filtration
