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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, India

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