Exhaustive research on fish farm diseases:
farming has expanded globally with an increase not only in absolute production
(kilotonnes/year) but also in the number of fish species being cultured in both
freshwater and marine systems. The increase in aquaculture operations
world-wide has provided new opportunities for the transmission of aquatic
viruses and the occurrence of viral diseases remains a significant limiting
factor for aquaculture production and for the sustainability of biodiversity in
the natural environment. Here we provide an overview of some of the significant
viral pathogens affecting finfish species."
Then there is this review:
members of the genus Yersinia cause human disease, including Yersinia
enterocolitica, Yersinia pseudotuberculosis and, most notably, Yersinia
pestis, the cause of bubonic plague. Yersinia ruckeri causes enteric
redmouth disease (ERM) of salmonids,
which is associated with significant aquaculture losses worldwide (
Austin, Allen-Austin, 1985 ; Tobback et al, 2007). A single human case
of infection with Y. ruckeri, of uncertain clinical significance, has
been reported ( Farmer et al., 1985). Several other Yersinia spp. have
been isolated from both fishes and humans, including Yersinia
frederiksenii and Yersinia intermedia ( Sulakvelidze, 2000), but
evidence of fish-borne zoonotic infections in this group is lacking."
ruckeri is a salmonid pathogen with widespread distribution in
cool-temperate waters including Australia and New Zealand, two isolated
environments with recently developed salmonid farming industries.
Phylogenetic comparison of 58 isolates from
Australia, New Zealand, USA, Chile, Finland and China based on
non-recombinant core genome SNPs revealed multiple deep-branching
lineages, with a most recent common ancestor estimated at 18 500 years
BP (12 355–24 757 95% HPD) and evidence of Australasian endemism." ...
"Despite the European and North American origins of the Australasian
salmonid stocks, the lineages of Y. ruckeri in Australia and New Zealand
are distinct from those of the northern hemisphere, suggesting they are
pre-existing ancient strains that have emerged and evolved with the
introduction of susceptible hosts following European colonization."