Main zoonosis transmitted by amphibians and fishes:

Bacterial zoonosis

Mycobacteriosis

  • infectious agent: a bacteria close to the tubercle bacillus: Mycobacterium marinum, or others. 
  • animal desease: 
    • very gradual weight loss of fish, whose head may then seem disproportionately large compared to the rest of the body
    • discoloration, stomach dug, back deformed, erratic swimming, abnormal droppings , regression of the fins and sometimes ulcers

fish with mycobacterium marinum

source: https://www.wur.nl 

  • Mean of contamination:
    • mouth-to-hand contact with dirty hands, contaminated by soiled water.
  • human desease : extremely painful skin nodules

Human with mycobacterium marinum

source: http://www.nejm.org/ 

Complete list of amphibians and fishes zoonosis