Fish Pop-eye in itself is not a disease but is more a symptom of an underlying infection. The fish eye bulges out in this manner because of fluid build up, either behind the eye or in the eye itself. The first signs you will notice is that one or even both eyes are starting to bulge. Slowly with time it can bulge to such an extent that the fish will look really shocking with the bulge.
The bulging eye may have a thin layer of 'skin' around it, this is a tough tissue that covers the eye keeping it in the socket and as the eye bulges it stretches the 'skin' with it. The fish may also get less active and show no interest in food. Fungus infections can show up afterwards.
If this disease is not detected soon after it is caught the fish can lose one or both of its eyes and its eye sight. Any impact the eye might be subjected to generally as a result of fighting, can cause this. If its one eye chances are it's injury, if its both then it is possibly a bacterial infection. Bad water quality is a common reason enough to be the cause. High nitrAtes/nitrItes, ammonia, metal or plastic poisoning can be the reason too. Unsuitable salinity can also be the cause.
The affected fish should be immediately taken out to be separately treated. It is difficult to specify a specific treatment unless the main cause is definitely known. Large daily water changes should help, if not Epsom salts has been used with good results to draw the fluid out. One tablespoon per 5 gallons of water for at least three days, longer if necessary. Epsom salts isn't really salt (sodium chloride) it is Magnesium Sulfate. If water quality is the problem, a 50 percent water change must be made as soon as possible.
If a new item was added to the aquarium recently, it should be double checked that it is not poisoning the water or letting off chemicals. The quality of the water conditioner that is used should be checked that it has a good opinion by other aquarists. If the water readings are wrong (high nitrAtes etc), a 50 percent water change is recommended again and 15-20 percent water changes 3-5 times per week, until the water readings are correct. Overstocking is a common problem for high water readings. Another common reason would be decaying dead fish and fish food. The tank should be thoroughly searched for any dead fish and precautions must be taken NOT TO OVER FEED, and if the tank is overstocked, steps should be taken in finding some of your fish another good home. If a bacterial infection is the cause we would recommend 'Maracyn', 'Maracyn II', 'eSHa 2000' and 'Anti-internal bacteria' for treatment.
References - Fish Lore Forum members: Carol and Laure AnneAbout the Author:
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