The Lymphocystis virus is present in almost all bodies of seawater and brackish water, so that any fish which suffer physical damage to body or fins may become infected. It is extremely rare for this disease to prove fatal as a primary cause. It could be due to a metabolic or nutritional disorder. Long, pale faecal casts. As soon as abdominal swelling is noted, isolate the fish and treat with a broad spectrum antibiotic.
Early treatment is essential.
On day 2 change all the water and add the medicine again at the same dose for another 2 days. Increase aeration during treatment. Do not use minocycline a third time in a raw. If the fish is still eating, soak the food in a concentrated solution of the antibiotic before feeding. Mites can be collected and removed from the surface damp cloth.