Treated sewage water can be used to breed a variety of fish that grow to appreciable sizes in captivity, Dr. K. Venkataramanujam, Dean, Fisheries College, Tamil Nadu Veterinary and Animal Sciences
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/sewage-pisciculture-holds-promise
[2] http://admin.indiaenvironmentportal.org.in/category/newspaper/hindu-chennai
[3] http://admin.indiaenvironmentportal.org.in/category/thesaurus/fisheries