I found one article on marine TB:
Human infection is clearly associated with mycobacterial infection in fish, most notably _Mycobacterium marinum_. _M. marinum_ causes an infection often called "swimming pool" or "fish tank granuloma."
These names are derived from the epidemiologic niche of the organism, occurring 2 to 3 weeks after contact with contaminated water. The lesions classically begin as small violacious papules on the upper extremities that progress to shallow, crusty ulcerations and scar formation. Although usually singular, multiple ascending lesions resembling sporotrichosis may be seen. Not necessarily associated with cutaneous disease, deeper soft tissue infection with _M. marinum_ has been reported in bursae or joints as well.
Most patients are clinically healthy with a previous local hand
injury that becomes infected while cleaning a fish tank, or patients may sustain scratches or puncture wounds from saltwater fish, shrimp, or fins contaminated with _M. marinum_. Swimming pools seem to be a risk only when nonchlorinated. Diagnosis is made from culture and histologic examination of biopsy material, along with a compatible history of exposure.
Photographs of cutaneous infections due to _M. marinum_ in humans can be seen at
http://www.reefkeeping.com/issues/2003-07/sp/feature/images/HandStevePro.jpg or
http://www.freshwater-aquarium-fish.com/images/m_marinum_granuloma.jpg .
One other zoonosis I found from fish was meliodosis, which has symptoms of enlarged lymph nodes. It is caused by a bacillus bacteria Burkholderia pseudomallei.
I hope he is getting better.
