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I purchased some yellow lab fry about a year ago, Now there about 1 1/2 inch long
and have no Black in there top fin at all. Is this just a deformidty or will it show up at a later age?
or are they no yellow labs?
 

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I know when they are younger they dont have a stripe and it is something they get over time btu Im not sure how big they are when it starts to appear.
 

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I have one yellow lab fry without black and both of its parents have black. I also bought the parents from a very reputable dealer so I know they are not hybrids.

Perhaps this one might get black on it since it is only 4 months old but since all the other fry have black I somehow doubt it.
 

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I have two yellow lab fry that are a month-6 weeks old (still hiding in the fry pile) and they both have black fins already . . . for whatever that's worth . . .
 

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lotsofish said:
I have one yellow lab fry without black and both of its parents have black. I also bought the parents from a very reputable dealer so I know they are not hybrids.

Perhaps this one might get black on it since it is only 4 months old but since all the other fry have black I somehow doubt it.
If it doesn’t get the black stripe, that would tell me it is a hybrid,

And if one of them are a hybrid, I would assume that they are all hybrids…
 

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If it doesn’t get the black stripe, that would tell me it is a hybrid
Why? Don't you think that genetic variation can occur on its own?
 

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lotsofish: I have never seen or heard of that happening.

cabinetmkr39: can you post a picture of the fish in question?

.
 

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Not the best picture but one I already have.

 

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I'd say it's a hybrid...but it looks liek there is a very slight trace of the black on the dorsal fin.
 

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I believe it is more likely to have a lab/estherae hybrid (commonly all yellow with no black dorsal) than it is for genetic variation in a pure lab to produce an individual with no black dorsal.

My current clutch of lab fry is one week old and I can already see fairly complete black dorsals on some of the individuals.
 

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Based on the pic, I think it is most likely pure. The picture is kind too small to be sure. He may be just stressed. Try feeding some good pellet like NewLifeSpectrum or Hikari Cichlid.

I believe with good food, the black dorsal will intensify if it is indeed pure.

Good luck.
 
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