Coastal Aquaculture and Mariculture (2+1)

Unit 6 - Culture of Crustaceans

6.1.3. Characteristics of shrimp culture systems

Characteristics	Extensive	Modified extensive	Semi-intensive
Pond size	>5ha	1-2 ha	<1ha
Engineering requirement	Not required	Moderate	Engineered for sustainable production
Availability of sites	Widespread	Widespread	selective
Initial investment/ha	Low	Moderate	Very high
Electricity	Not required	Partial backup	Complete backup
Stocking densities (No./m2)	`1-1.5	5-10	15-30
Feed	Natural	Natural + formulated	Formulated
Feeding frequency	-	1-4/day	3-6/day
Water exchange	Tidal when necessary	Upto25% per day using pumps	Upto 40% per day using pumps
Supplemental aeration	None	In emergencies	Continuous
Survival (%)	50-90	70-80	70-80
Production	300-800Kg/ha/crop	1.5-3.0 tonnes/ha/crop	4.0-7.5 tonnes/ha/crop
Size at harvest (g)	20-60	20-50	20-40
FCR	-	1:1 to 1:1.5	1:1.5 to 1:1.7