Why does this happen and how do I prevent it?
Deformities in fish can be very alarming and unfortunately are often the result of viral infections or tumours which are not directly treatable. In much the same way as humans the best way to treat viral infections is to support the body’s immune system which will fight of the problem.
(note: if your fish has developed a swollen area / growth around the eye this could be pop eye, a bacterial infection)
Large swellings or lumps which develop under the skin are usually tumours ( often caused by a genetic predisposition) which are unlikely to disappear. If the tumour is benign and does not effect swimming, breathing or feeding the fish can often continue live for many years.
Key areas to consider to aid the immune system of your fish and reduce stress include:
- regularly testing your water for ammonia, nitrate, nitrite and pH and reacting accordingly
- complete regular maintenance to ensure a clean and healthy pond
- be aware of pollutants entering the pond through heavy rainfall, run off into the pond, wildlife and garden chemicals like pesticides
What treatment should I use?