Tilapia

General

• Nile tilapia grows to 9 lb and 9 years old - [1]
• Overview of integrated growing with duckweed and algae - [2]
• UFG design basics - [3]

Temperature

• Best temparature is 72-90F - [4]

Grow Beds

• 1 cubic foot of grow bed for every pound of tilapia - [5]
• 6-10 gallons of water for every square foot of deep (12") grow bed - [6]

Growth Rate

• Exponential, linear, and plateau growth rates are the normal course of life of a tilapia. Depending on the genetics, the growth rate is linear up to from 1-3 lbs of weight. Linear phase starts at 100 grams, and before that, the rate of weight gain increases. - [7]
• It takes 6-12 months until harvest. - [8]
• 2% average growth rate of tilapia - [9], but .7% if fed duckweed alone - [10].
• 1-3% in linear stage - [11]
• Fish growth in lenght is linear, but weight gain is overall exponential in the general case - [12]

Stocking Rate

• 1/4 lb per gallon without supplemental pure oxygen. With oxygen, stocking up to 1 lb per gallon is possible. -[13]
• 5-9 lbs per cubic foot with oxygen - [14]. Same? 1 cubic foot = 7.5 gallons. Thi
• Bright Agrotech - correct stocking rate of 1 lb for 8-10 gallons of water - [15]. This rate allows for flow aearation, as opposed to air pump aeration - allowing the splash of flowing water to provide adequate oxygen. Summary: this figure is 1/2 or less the MSU publication above - so consistently conservative.
• 3 gallons to one pound of fish - [16]
• 1 lb per 5-10 gallons of water - [17]

Stocking Rate for Fry

• Southeast Asia stocking of fry - not adult carrying capacity of the water - .7 kg/m2 - [18] - if 1 meter deep, that is 264 gallons

Feeding

• In tilapia monoculture systems, animal manures stimulate phytoplankton which the tilapia feed on - [19]
• Tilapia can feed on duckweed alone with a 1:1 fish conversion ratio. Feed Conversion Ratio is best on duckweed alone, though the growth of the fish was half of that on a mixed diet. - [20]