Table 7. Production and economic indicators of cage culture of grass carp (5 months) fed on different diets
		Feed type
	Units	Grass	Pellet	Grass and pellets
Initial fish weight	g	430	430	430
Stocking density per cage (cage size 4 X 2 X 2.5 m)	no.	500	500	500
Total amount of feed fed during grwoth period	kg	16,700	1,550	8,350+1,480
Number of fish harvested�	ind	413	405	438
Harvested biomass	kg	623	861	1271
Average final fish weight	kg	1.51	2.13	2.9
Survival	%	83	80	88
Cost of fingerling	USD	345	345	345
Medicine cost	USD	20	24	27
Feed cost	USD	208	342	104+326
Total income	USD	915	1,265	1867
Net profit	USD	342	555	1072
Input and output ratio		01:01.6	01:01.8	01:02.4
Data source: Lu and Deng (2003)