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Gill Rot

Symptoms include breathing difficulty, gasping, lethargy, and discolored and eroding gill filaments. The fish may hover at the top of the aquarium, gasping for air. If left untreated, the fish will suffocate and die.


Gill Rot occurs as a result of low oxygen content in the water, which is often the result of overcrowded aquariums or ponds. Such a scenario is a problem because the heavy loads of organic matter, high nitrate levels and high temperatures allow the Fungi of the genus Branchiomyces to infect and destroy the gills of your fish.


Perform an immediate water change in an effort to increase the water’s oxygenation. Gravel or pond bottom filters should be cleared of debris. Added aeration should be supplied. Formalin is the medication of choice for Gill Rot.

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