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Other bacterial causes of pop-eye are from Mycobacteria (fish TB) and Nocardia. Fish infected with these bacteria tend to waste away and may have open ulcers on their bodies. Few studies have been performed to determine which antibiotic is best to treat fish TB. There has been some reported success with minocycline (Maracyn-Two) and kanamycin (Kanacyn). Interestingly, minocycline successfully treats Mycobacterium marinum (fish TB) in humans!
Viral causes of pop-eye have been identified in the fishing industry in channel catfish, trout and salmon. These viral diseases cannot be treated with medication and all fish must be destroyed, as it is very contagious. Even the survivors of these viral diseases are destroyed because they then become carriers of the virus with the potential to spread it to healthy fish.
Pop-eye is very rarely a result of such parasites as Ichthyophonus and flukes. The fungal-like organism, Ichthyophonus hoferi, formerly known as Ichthyosporidium, is not the same as Ich (Ichthyophthirius multifiliis). The disease that it causes is known as Swinging Disease or Tumbling Disease, as fish infected with it rock, sway and even tumble as they swim. No treatment is known and affected fish should be removed from the aquarium and destroyed. Eye flukes (Diplostomum) cause the eye to become cloudy, on occasion to bulge and often leads to blindness. This parasitic infection can only result from a fish being exposed to an intermediate host in its’ life cycle and usually that’s a snail.
An inadequate diet may result in pop-eye. In this circumstance, you would also expect to see other signs of severe starvation or malnutrition, such as curvature of the spine. It is important to provide a varied diet to meet the nutritional requirements of your fish. Remember that flake and freeze-dried foods provide moderate nutritional adequacy, pellet and frozen foods provide high adequacy and live foods provide the highest.
Pop-eye may be seen with dropsy, which is a condition in which fluid accumulates in the abdomen as a result of dysfunction of the internal organs. A fish’s scales will stick out and away from the body, giving it a “pinecone” appearance. Also, the underside or belly may look swollen in dropsy. This condition is very often fatal yet some within the goldfish community boast success when treating dropsy in its’ earliest stages. This treatment includes treating your fish for the first three days with a medication, such as Rid-Ich+, for external parasites in a hospital tank. This is then followed by rapidly raising the water temperature to 86*F, using extra aeration to keep the oxygen levels high and treating for a bacterial infection as outlined above for septicemia (e.g. feed Medi-Gold and/or use Kanacyn or Augmentin in the water), for as long as 2-4 weeks. Epsom salts are to be used at the rate of 1/8 of a teaspoon per five gallons of water to reduce swelling. Do not use aquarium or other similar salts as this may worsen the swelling.
A bulging eye may be seen as a result of injury. If both eyes are affected, then trauma is unlikely to be the cause.
Finally, pop-eye can very rarely be the result of a tumor, located behind the eye, pushing it outwards.
The good news is that pop-eye is not often fatal, especially if given proper treatment. Pop-eye will sometimes even go away on its’ own with no treatment. As pop-eye is generally not very contagious, one fish expert, Dr. Chris Andrews, recommends observing your fish with pop-eye, while left in the main tank, to see if he gets better on his own or not. If the other previously healthy fish in the tank begin to get pop-eye, he then recommends isolation and treatment of the affected fish. I would advise that you search carefully for the cause of the pop-eye as discussed in this article and treat accordingly. If you cannot figure out the cause, then I recommend treatment with either Kanacyn or Maracyn-Two, for a possible bacterial infection, in a separate hospital tank. While the main tank may be treated with these antibiotics without harming its’ biological filtration, treating in a hospital tank allows you to isolate the sick fish from the others and medicating a smaller tank means lower medication costs.
Even with proper treatment, your fish may be left with a grotesque eye and fish have even been known to “lose” the eye, that is, the eye becomes detached from its’ socket. Losing an eye is not necessarily traumatic for a fish. Fish can live a relatively normal life with just one eye, except that they can have problems with depth perception, that is, knowing how close or how far things are away from them. This can make swimming and eating a bit of a challenge. A fish that is blinded in one eye should not be destroyed, as they most often can live out a healthy and full life!
Please feel free to ask for help when one of your fish has pop-eye or other condition in the Flippers 'n' Fins' Emergency Room!