With dropsy, the fish take on a bloated appearance, so a lot to ensure that it looks as if it’ll burst at any moment; the scales stand out from the body, and occasionally even the eyes will bulge.
A fish will suddenly develop dropsy for no apparent reason, but luckily it is never an epidemic, and after removal of the sick one, no other precautions are essential to safeguard the other people.
At the time of writing there’s no recognized cure, and also the illness generally proves fatal within 3 weeks. You are able to as a result save the fish some discomfort by destroying it instantly the symptoms develop.