UVI Research and Technology Park

UVI Commercial Aquaponic System (CAS)

The CAS integrates tilapia aquaculture with vegetable hydroponics.  The system intensifies production on a small area of land, reduces the amount of water needed to produce 2 separate crops and reduces wastewater discharge into the environment.

A full view of the UVI Commercial Aquaponic System

System components
US customary units SI units
Four fish rearing tanks (ea.)
2,060 gallons 7,800 liter
Two cylindro-conical clarifiers (ea.) 1,000 gallons 3,785 liter
Four filter tanks (ea.)
185 gallons 700 liter
One degassing tank
185 gallons 700 liter
Six hydroponic tanks (ea.)
3,000 gallons 11,356 liter
Total plant growing area
2,300 ft2 214 m2
One sump, 
160 gallons 605 liter
Base addition tank, 
55 gallons 208 liter
Total water volume
 29,000 gallons 110,000 liter
Land area 1/8th acre .0.05 hectare

Tilapia harvest of one rearing tank occurs every 6 weeks.  Stocking is staggered to achieve a fairly consistent input of feed.  Tilapia fingerlings are stocked at about 2 oz. (50 g) size and reared for 24 weeks to 2 lbs. (900 g).

CAS harvest   CAS tilapia harvested from the system

CAS rearing tanks are shaded to reduce algae growth, keep the water cool and provide subdued light to the fish. The tanks are aerated with diffused air.  Water is pumped continuously through the tank at a rate of 25 gallons/minute (100 l/min) providing a full volume exchange every 1:20 hrs.

CAS rearing tanks

Water leaving the rearing tanks moves through clarifiers and net filter tanks for removal of all solid waste.

CAS clarifier, filter and degassing tanks

A variety of vegetables can be grown in the hydroponic tanks.  Leafy greens are highly recommended because of their close planting density, short growth period and frequent harvest.  Fruiting crops are also productive but require more water quality management.

CAS lettuce production

CAS roselle production  CAS summer squash production

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