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<International Source Book On Environmentally Sound Technologies
for Wastewater and Stormwater Management>
9.3.2 Case Study 2 - Wastewater-fed fish culture
The largest, single wastewater-fed aquaculture system in the
world lies to the east of Calcutta, West Bengal, India in an area locally called
the East Calcutta Wetlands (Photos 8, 9). The system, developed by farmers in
the first half of this century, has been well documented (Ghosh, 1990) with a
view to preserving its benefits for the city and replicating the experience
elsewhere (Ghosh, 1998).
Photo 8: Wastewater-fed fish ponds in Calcutta, India. A canal system to distribute
untreated wastewater to the fish ponds is in the foreground and center.
Photo 9: Harvest of a wastewater - fed fish pond, Calcutta, India
An improved wastewater-fed aquaculture system inspired by the
Calcutta experience has recently been implemented in three smaller cities in
West Bengal (Ghosh, 1995, 1998) as part of the Ganga Action Plan, which aims to
improve the water quality of the River Ganges (Photos 10,11).
Photo 10: Pumping wastewater into an anaerobic stabilisation pond at Bandipur,
West Bengal, India
Photo 11: A fish pond fed with treated wastewater at Bandipur, West Bengal,