The mucky sediment below fish farms usually teems with antibiotic-resistant bacteria.
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/feeding-time-worries
[2] http://admin.indiaenvironmentportal.org.in/category/newspaper/economist-london
[3] http://admin.indiaenvironmentportal.org.in/category/thesaurus/fish
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/antibiotic
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/pisciculture
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/china
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/scientists