Variables Price rate (BDT)* In Bangladeshi Taka (BDT) T50 T75 T100 T125 Fixed/common cost           Net cage (18 m3) 4000/unit 4000 4000 4000 4000 Plastic drum (250 L) 500/unit 2000 2000 2000 2000 Subtotal   6000 6000 6000 6000 Variable costs           Juvenile monosex tilapia 3/juvenile-1 2700 4050 5400 6750 Feed cost 42/kg 16921 22886 27990 27664 Auxiliary materials (bamboo, anchors etc) for supporting cage   5000 5000 5000 5000 Subtotal   24621 31936 38390 39414 Total   30621 37936 44390 45414 Interest on inputs (4 months) 10% annually 1021 1264 1480 1514 Total inputs   31642 39200 45870 46928 Financial returns           Monosex tilapia sale as total returns 250/kg† 200/kg‡ 180/kg¶ 55655 56820 67752 58095 Total net returns   24013 17620 21882 11167 Benefit cost ratio (BCR)   0.759 0.449 0.477 0.238

*1 US $=80 Bangladeshi Taka (BDT) †price of monosex tilapia of T50 group ‡price of monosex tilapia of T75 and T100 groups ¶price of monosex tilapia of T125 grou Table 5: Cost and return analysis of monosex tilapia in different stocking densities from single unit of cage (18 m3) after 120 days