abnormal swimming position – desease?

Hi Patrick
Do not worry, I know this and have this more often. This is a symptom of old age, this is called backbone deformirung. As in humans at the age is not so bad, the animal is still alive, but does not produce more children and can not eat as good as the others and is always too short, at some point the animal is then dying of weakness. Everything ko and normal, not a disease or other bad.
Greeting Bernd 🙂

I have seen this before, – but I am unsure what it is, therefore I cannot say anything very helpful probably.
I have experienced it in different settings, – I think its an illness related to the swimbladder. Which of course may also occur in older fish due to weakness. But I am sure it can also happen to fish for other reasons.
As I remember, there are two things which I have previously suspected. One, something which can occur to a fish under spawning. Normally not, but if something goes wrong.
Two : something to do with change in waterquality, where there is an unwanted development of amonium (perhaps because there has not been a moveover of the material on the bottom).
But these are very poor amateurish ideas, I cannot say anything for certain.
But my experience is that it is not contageous, – it is also very unlikely to be completely cured. But I have seen fish live with it for quite long periods of time.
I have also seen it progress more quickly and leading to death of the fish.