Table 6. Cost benefit analysis of shrimp (Penaeus monodon) culture (1 ha area) in presence of Najas indica

Particulars	Treatments
	Control (without Najas)	T1 (20% of Najas)	T2 (40% of Najas)
Total variable costs (BDT)	130,000	130,000	130,000
Total fixed costs (BDT)	10,000	10,000	10,000

Production
Yield (kg)	397.86	832.8	641.62
Price (BDT/kg)1)	500	650	600

Economic analysis
Total production costs (BDT)	140,000	140,000	140,000
Gross return	198,930	541,320	384,972
Net profit	58,930	401,320	244,972
Benefit/ cost ratio	0.42	2.86	1.74

Shrimp price varied according their size.
BDT, Bangladeshi currency.