| Name of Disease | Probable Cause | Appearance | Species of Fish Affected | More Info |
| Eye flukes or "cataracts" | protozoal parasites | affected fish have eyes which may appear opaque or have white lines running across its surface; fish poorly developed because of impaired vision | most SK fish species |
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| Pop-eye | sudden change in gas content of water | inflammation behind the eyeball or accumulation of gas bubbles | any species |
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