Red tilapia

Thai red: Red and round is the best way to describe this strain.

Origin:

Introduced into Thailand in the seventies and kept at the National Inland Fisheries Institute (NIFI) for many years.  Came to Nam Sai from the Thai National Aquatic Genetics Research Institute (NAGRI) in 2000. 
Growth: Not so different than the growth of Niles.  In 6 months (from 0.2g) attains 700g in fed ponds or cages (not reared in fertilized ponds in Thailand).
Shape: Short and round with a big girth.  
Fillet yield: Same as Nile  tilapia  
Colour:  Was originally pale, but is now close to the red colour of the Taiwanese red.  Very few black spots, but red and white colouration is still a little patchy.
Maturity:      6 months.  
Egg yield: 30-50 eggs/m2/day in spawning hapas  
Disease resistance: Low to moderate  
     
Taiwanese red  - A very red strain with a Chitralada shape.
Origin: Acquired from a local mixed sex hatchery who imported a few fish from Taiwan in 1997.  Was previously interbred with Nile tilapia and colour was very poor.  Nam Sai spent 4 years improving the colour of this strain before introducing it to the Thai market in 2001.
Growth: Grows very similar to the Thai red.  In 6 months (from 0.2g) attains 700g in fed ponds or cages (not reared in fertilized ponds in Thailand).
Shape: Longer, not quite as fat, but still round like the Thai red.   
Fillet yield: Same as Nile  tilapia  
Colour:  Vivid red with very few black spots.  Colouration is still a little uneven due to varying shades of red and some white.
Maturity:      6 months.  
Egg yield: 30-50 eggs/m2/day in spawning hapas  
Disease resistance: Low to moderate  
     
Nam Sai red hybrid - Used for all of Nam Sai's red tilapia monosex production.

Origin:

This is an F1 hybrid and not a pure strain. It is created by crossing Thai red and Taiwanese red resultling in some hybrid vigour.
Growth: Faster than pure red strains. In 6 months(from 0.2g) attains 750g in cages (not reared in fertilized ponds in Thailand).
Shape: Short and round with a wide girth.  
Fillet yield: Same as Nile  tilapia  
Colour:  Vivid red, few black spots, but red colouration is patchy. Colour is environmentally related as in Nile tilapia. Is red in "green water" ponds and cages in clear water. Goes pale in concrete tanks and cages in rivers with high turbidity.
Maturity:   Not used for breeding.  
Disease resistance: Moderate and higher than pure strains. Good resistance to Streptococcus agalactiae.