ABSTRACT
An effort to treat the aquaculture effluent was made by using in-pond raceways and Photobioreactor in the Advanced Research Farm Facility, Madhavaram of Tamil Nadu Fisheries University. The cost per unit volume of in-pond raceways is lower because raceway structure is built with an excavation along with the rudimentary protection against erosion, so that the total cost can be kept smaller. The relative disadvantage of in-pond raceways is that in the absence of a final settler the effluent in principle has the same composition as the mixed effluent so that biodegradable material and suspended solids will be discharged. Ecologically sound management techniques are getting popular for the sustainable production of the aquatic animals to meet the raising global food demand. Biofloc based farming is one of the sustainable techniques where manipulation of Carbon Nitrogen ratio in the culture system through external application of carbon sources or lowering the protein level in the feed stimulate the floc production process.
