Blue Gene Jack Dempsey

[Athletic_Amph]

How do you know they have the blue gene if they haven't bred before?

if they haven't bred before, the only way to know is through lineage. you would need to know what each of the parents of the JD in question were

 

[Athletic_Amph]

Sorry, CaliFishGuy, I didn't realize that you were probably asking the OP how he knows they are BG carriers to begin with... lol

 

[CaliFishGuy]

Sorry, CaliFishGuy, I didn't realize that you were probably asking the OP how he knows they are BG carriers to begin with... lol

Yeah that's my point. If they have never bred then you won't know without some sort of genetic testing. Even a fry from an EJBD and a regular JD might still not have the blue gene.

 

[DannyD]

I wish I could remember who it was that was breeding jacks for ebjd. I just saw the post yesterday. (I was reading a lot of older posts yesterday on this forum and another) They showed the regulars next to the eb and it was a big difference. The eb were very light with no black from what I recall. They were smaller then the pic above.
Hopefully someone chimes in soon to give you a hand. I wish my memory was better, lol.

I can definitely distinguish some lighter color fry. Thanks!

 

[DannyD]

How do you know they have the blue gene if they haven't bred before?

Hi, Never 100% sure about anything... I picked up a handful of electric blue and blue jean jacks in Cleveland OH from Something Fishy. Fantastic LFS. I'm fairly confident.

 

[bobblehead27]

Yeah that's my point. If they have never bred then you won't know without some sort of genetic testing. Even a fry from an EJBD and a regular JD might still not have the blue gene.

An ebjd mixed with a regular jd should have 100% bg

Bg with bg should be 25% ebjd 50 %bg and 25g regular jd

That's my understanding based off my knowledge of genetics which is admittedly limited.

 

[Tomt37]

I'd also split them by size early on a few times if you can as I think the ebjd gave a slightly slower growth rate so you have a better chance of growing more of them by grouping by size .

 

[CaliFishGuy]

An ebjd mixed with a regular jd should have 100% bg

Bg with bg should be 25% ebjd 50 %bg and 25g regular jd

That's my understanding based off my knowledge of genetics which is admittedly limited.

Isnt that only true if the regular jd has a blue gene? If the regular one doesn't have a blue gene then there should be at most only a 50 percent chance of the fry having a blue gene? Since the blue gene seems to be recessive then wouldn't that decrease the odds even further?

 

[Stevie p]

I did a video identifing the electric blue jacks and the blue GENE babies when they are very small. Here it is.

 

[Stevie p]

Isnt that only true if the regular jd has a blue gene? If the regular one doesn't have a blue gene then there should be at most only a 50 percent chance of the fry having a blue gene? Since the blue gene seems to be recessive then wouldn't that decrease the odds even further?