Unusual Fry behavior

[FishTankMan]

Ok the batch of fry I have are doing fabulously (did I say that). But I have 4-5 runts that are acting peculiar. there heads up and trying to get to the surface of the tank they get there but just stay there with there heads up toward the surface. When I place my finger near them they skoot away and seemed to swim normally but immediately go back to doing the same thing. Are they just weird or is it something else?

 

[Michiba54]

Sounds like they are struggling for oxygen or think you are gonna drop food in for them.

 

[FishTankMan]

If that was the case all of them would do it its only about 5 out of 150.

 

[SCGeordie]

If they are the runts of the litter it may be that their gills have not fully developed.

 

[FishTankMan]

If they are the runts of the litter it may be that their gills have not fully developed.

Hmm Its time for me to cull them then?

 

[SCGeordie]

Hmm Its time for me to cull them then?

Well, they may improve with time, but if you are planing on culling at all then they would be my first choice.