06-03-2012, 06:24 PM
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First, dropsy is not a disease, it is a symptom of something else. It is caused by a buildup of fluids inside the fish's body. Sometimes it can be due to constipation, as in betta bloating, other times, it can be due to bacerial infection or parasites. It is really necessary to try to understand why the fish is experiencing dropsy.
Second, the recommended procedure is to quarantine the fish and keep it in pristine water. Most fish with dropsy symptoms will die, but you might get lucky. I have recovered one fish with dropsy symptoms, but it had other issues and died from complications of a prolapsed colon a few months later.
Third, it's very easy to snag pineconed scales, and you can tear a hole in the fish's skin. Try to capture the fish in a dip'n'pour instead of a net if possible.