11-13-2009, 03:48 PM
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Originally Posted by Flambo
I have a yellow molly that within the last couple of weeks has started displaying some strange behaviour. She seems perfectly healthy but has started randomly spinning around in circles, not chasing her tail but more like barrel rolling - any idea why that maybe?
Have taken some video but not sure how to upload it?
It could be "Whirling Disease". The disease is caused by a microscopic parasite known as Myxobolus cerebralis.
In an infected fish, the parasite can affect nerves and cause cartilage damage which results in the outward signs of whirling disease. Whirling disease gets its name from the abnormal whirling or tail-chasing behavior exhibited by some infected fish. Other symptoms may include a black tail in younger fish. In older fish, signs may include deformities to the head or body. Severe whirling disease infections can kill fish. Carriers with no visible signs of disease are common. Although most common in game fish aquarium fish are susceptible and it's spread easily. Have you fed them live Tubifex worms? This is a common culprit in spreading the disease.
I'm afraid the prognosis is not good. You may want to separate her from the others and read the article at this link; http://freshaquarium.about.com/cs/disease/p/whirling.htm
If it were Dropsy she would probably be swollen and appear bloated. Swollen areas may exhibit a 'pine-cone' appearance caused by the fish's scales sticking out. You can best see this by viewing your fish from the top. Fish may also stop feeding, appear off-colour, become listless and/or lethargic, have sunken eyes, and hang at the top or stay at the bottom of the aquarium.