Popeye And Distended Belly. It’s often accompanied by the feeling of being bloated with trapped gas or digestive contents. One of the reasons why male guppies have a big and bloated belly is the dropsy disease.
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The prime symptom is, obviously, that they’re bloated! When a betta is suffering from dropsy, its belly will look like it has ‘dropped’, and appears to be hanging down. Popeye/cloudy eyes, fin & tail rot, dropsy (bloated fish), etc.