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In sailfins sometimes the white region at the beginning of the dorsal fin is present. It looks a bit like a disease, but it's really a result of a skinny fish. The white is the large muscle needed for the dorsal fin to be raised. As soon as the fish is fed well the muscle will no longer be visible.
The fish on the left suffers from a spinal deformity. Although not a disease in itself, it may be the result of fish tuberculosis. But it may also be the result of inbreeding or physical damage during transport or something similar.
If you start to breed fish, sometimes a few fry suffer from a sympton, which is known as belly-sliders. In livebearers (and also in other fish) this occurs if the fish haven't managed to fill their swim bladder with air in the first 24 hours. Othe fish may have a genetic deficiency, or a broken swim bladder. In all cases the fish should be euthanised, or at the very least never be used for breeding!.


 

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