04-02-2011, 11:36 AM
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There's really only one disease that transfers to humans, and it's the fish tB- AKA Mycobacterium.
If you have it in your tank, you would know. The symptoms aren't subtle- curved spinal columns, severe wasting, extreme dropsy, and more or less a quick death. It's slow growing, but still.
Symptoms and treatment in humans-
When aquarists become infected with fish tuberculosis, it normally starts as a skin problem. Mycobacterium marinum is a slow growing mycobacterium and it can therefore take several weeks before you notice any symptoms. The first sign is normally small purple lesions or “bumps”. The lesions will grow and spread and Mycobacterium marinum can proceed to destroy the soft tissue under the skin, including tendons and joints. In severe cases, fish tuberculosis can spread to the bones and cause symptoms similar to arthritis.
Plants don't catch this though... I bet a simply rinse would be fine for eating plants, or simply let them grow emersed.
Have you thought of water chestnuts growing emersed?