Ornamental Fish Q&A 13


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A four-year-old redtail catfish kept in a 530-L tank began to develop mild fin necrosis about six weeks ago. The owner has treated the fish with antibiotics, first with a two-week course of tetracycline added to the water at 400 p.p.m. and then a kanamycin water treatment for the entire tank at 100 p.p.m. A day after the kanamycin treatment, the redtail catfish was found on its back with a swollen abdomen. You conduct water analysis of the tank and find total ammonia to be 1.0 p.p.m. and nitrite to exceed the limits of your test kit, which is 4.0 p.p.m.


Question Answer Article
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