Post midterm Tilapia

Question 1

Euryhaline def’n

Answer 1

tolerate range of salinity

Question 2

Tilapia: Salinity preferences

• o. mossambicus
• o. areus
• o. niloticus

Answer 2

m: sound in salt water
a: hypersaline pools 41-45%o
n: LEAST TOLERANT can be found in sw. 5-10%

Question 3

Tilapia: DO preferences

Answer 3

niloticus and mossambicus MAY survive in 0.1ppm

protection oxygen concentration in recirc 4-5ppm

Question 4

NH3 preferences for tilapia

Answer 4

tolerate unioized [NH3} 2.4ppm

Question 5

CO2 concentration for tilapia

Answer 5

up to 70ppm

Question 6

pH and Alkalinity for tilapia

Answer 6

prefer hard alkaline water

CaCO3 >or equal to 150ppm

Question 7

Feed preferences for tilapia

Answer 7

omnivorous = huge range in diet
table scraps, rice bran, wheat bran, oil seed cakes.
-ideal 24-35% protein.
-often large % is soy meal

Question 8

Feeding preferences for tilapia

Answer 8

• prefer frequent small meals
• feed at any depth and off bottom
• manual, scatter and demand feeders. high density culture
• floating pellets for surface feeding
• some home mash used. not for cage culture

Question 9

Tilapia grow out

Answer 9

-extensive culture. feritlize only
semi intensive and semi extensive; fertilize and feed
-intensive, feed only

Question 10

Extensive culture for tilapia

Answer 10

-small ponds 0.1-2.5ha
usually less than 2 m and commonly 1m deep
ponds should be drainable
stocked at 1-50g

Question 11

Tilapia: polyculture. name 4 species

Answer 11

i) common carp
ii) grey mullet
iii) grass carp
iv) silver carp

Question 12

intensive tilapia culture

Answer 12

• indoors, heated water, circular tanks
• often use geothermal water or waste heat
• use depuration tanks