What Causes Gill Rot

Definition: It is a fungal disease involving gill tissues, affecting the most species of freshwater fish. The disease is caused by Branchiomyces sanguinis and Branchiomyces demigrans. It is characterized by areas of infarctive necrosis of the gills, anorexia, and marpling appearance of the gills.

What causes gill rot in fish?

Bacterial gill disease typically occurs as a result of poor living conditions, such as overcrowding, poor water quality, high organic debris, increased temperature of the water, and increased ammonia levels.

What is the causative agent of Branchiomyces?

The disease is caused by Branchiomyces sanquinis, an obligate pathogen, and is more common in other species of fish than striped bass. Branchiomyces sanguinis grows within the branchial blood vessels, but hyphae may protrude from necrotic tissues.