See this link for a 2012 article on drugs in [chicken-based] feather meal, commonly used in fish farm feed, that results in bacteria, including e-coli, that are resistant to the antibiotics we use to treat humans for disease: <a href="http://pubs.acs.org/doi/abs/10.1021/es203970e?journalCode=esthag.In">http://pubs.acs.org/doi/abs/10.1021/es203970e?journalCode=esthag.In</a> 12 feather meal samples, which were collected from six states and China, they found 59 pharmaceuticals and