Originally Posted by Coppermoon
I got my diagnosis today. It IS Mycobacterium! This is what is considered fish TB (but from the Lab Manager....it is NOT TB!!!!!!!) Which verity is unknown because it would have cost me 3x as much as I'm gonna have to pay (which that is still unknown). The rot is a secondary infection...the fish is dying so the fins go first.....
Here's what I found:
It is not called TB because this is specifically reserved for Mycobacterium tuberculosis
, which causes TB in people, but does not affect fish.
There are several types of Mycobacterium
that do affect fish. As a group, they're just called “atypical mycobacteriosis," and all fish are susceptible to them (to one degree or another). It results in a chronic and progressive disease
. However, the symptoms and signs can vary widely, so there is no "typical" presentation.
thrives in warm water temperatures, that have low dissolved oxygen levels, acidic pH, and and lots of organic material.
In the lab, classifying the organism as Mycobacterium
is relatively straightforward. However, determining the exact species is a more involved process. (This is why it costs a lot more.) Different species grow at different rates, under different types of conditions, etc.
However, it doesn't really matter what species is present, because: "Mycobacterial infections of all fish should be considered non-treatable. Although there are some research reports of aquarium fish responding to antibiotic therapy, individual fish have not been cured of the disease
. Symptoms may resolve temporarily but often reappear when antibiotics are discontinued. As described for food fish, depopulation and disinfection of all contaminated equipment is recommended."
Source: Mycobacterial Infections of Fish
- Southern Regional Aquaculture Center (SRAC Publication No. 4706) - November 2011