How to Design an Environmental Disaster

So, not only are chicken fed on fish, but it seems that fish get fed chicken as well... A very cunning way to maximize the possibility of infectious agents propogating on farms.

Bird flu may be spread by using chicken dung as food in fish farms, a practice now routine in Asia, according to the world's leading bird conservation organisation.

Fertilising fish ponds with poultry faeces, which can dramatically improve fish growth, may set up major new reservoirs of avian influenza infection if the chickens providing the manure are infected themselves...
Independent