What causes protruding eyes in fish

(Exophthalmus)

Signs of infection One or both eyeballs of the fish protrude abnormally. (Note: Some fish, especially ornamental goldfish, have protruding eyeballs from birth.)

Affected fish Exophthalmus can affect many pond and aquarium fish

Details of infection The development and contagiousness of the disease depend greatly on the cause, and the cause is often very difficult to determine. Swollen eyeballs can be caused by many factors, including fish tuberculosis, white spot disease, dropsy, worm cataract (caused by various trematode larvae, such as Diplostomum) and bacterial infection.

Recommended treatment The use of antiparasitic and antibacterial treatments may be effective.