06-06-2010, 06:11 PM
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There are 3 things to my knowledge that cause curvature of the spine in fish.
1- Vitamin deficiency- Can't see it happening to one young fish though. Would be the whole batch or an older one.
2- Genetic Abnormality- causes by too much inbreeding, either on purpose (many colorful fishes will have this problem, along with black mollies, etc, and livebearers get it a lot too because they breed with anything that moves- brothers and sisters, parent and child, etc. That's why you don't marry your cousin. :)
3. Fish TB. Unlikely, but keep an eye out for a discoloration and signs of sickness.... Look up for symptoms of TB, I know one symtom is curvature of the spine. Also, if you think it's a possibility, wear gloves in the tank. It can spread to humans.
Even so, I bet it's a genetic issue. They do well for a while, but eventually die. (I think it's because their organs can't grow properly.) Wouldn't euthanise it though, just let nature play its course. Seems like then my guppies (usually happens when I buy a pregnant fish from the LFS) have it, they do fine, and maybe over the course of an hour or two they have something I would decribe as chronic organ failure. Not much suffering.