Table 8. Harvest of three tested ponds fed different diets for grass carp
	Pond area	Grass carp	Mortality	Silver carp	Bighead carp	Total production	Total productivity	Production of grass carp	Profit
	m2	production (kg)	(%)	production (kg)	production (kg)	(kg)	(kg/ha)	(kg/ha)	USD/667m2
Fed with grass	1,200	620	91.3	81	18	719	5,992	5,167	159
Fed with raw ingredients	1,333	772	82.5	125	25	922	6,917	5,791	77
Fed with pellets	1,267	1,073	92.5	112	23	1,208	9,534	8,469	234
Data source: Duan et al. (2005)