Gill hyperplasia

Medical condition in fish

Gill hyperplasia is a medical condition consisting of the inflammation, hyperplasia, or hypertrophy of gill tissue, caused by disease, poor water quality, or injury of the gills. Gill function is often impaired, causing significant oxidative stress. Anabantiformes endure hyperplasia better than other species due to the possession of a labyrinth organ. Gill hyperplasia is frequently accompanied with symptoms including lethargy, lack of appetite, and floating near inlets. Secondary bacterial infections and septicemia may occur as a result of deterioration in respiratory function.

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