what is wrong with my fish,there spine is bent

[dolly_daydream]

hi all
just wondering if you guys could help me,i have a 140 litre tank with a shoal of about 20 danios all about 3 quarters of a inch to 1 inch long,there my first fry from september,anyway my tank is fully cycled,and all my reading are great but ive noticed that a few of my danios have developed bent spines,there eating and swimming just the same but there is 1 that is so bent is looks like thi shape ~ seriously,what wrong with my babies please help i know this isn,t normal even if there acting normal,
thanks in advance,
p.s
i do a 25% water change weekly also

 

[charmd2]

Either way to much inbreeding, and even if you just bought them, it is possible you got a batch that had been over inbred already.

Or Fish Tuberculosis. Either one can and will cause bent spines/deformities.

Other than that not sure, I'm sure someone else will be along shortly.

 

[The-Wolf]

A bent spine is a common birth defect, but if a fish suddenly develops a bent spine, poor nutrition from an inadequate diet or Tuberculosis may be the cause.