Nile tilapia

Chitralada : Our original and still ever popular strain of Nile tilapia.

Origin:

Introduced into Thailand in 1965 when the Emperor of Japan gave 50 fish to H.M. King Bhumibol. These fish were initially bred at Chitralada Palace, hence the name.  Nam Sai acquired the fish in 1994 from the Asian Institute of Technology, Bangkok. 
Growth:

Very fast grower to 250g, but slows down somewhat over 500g.  In 6 months (from 0.2g) attains 400g in fertilized ponds and 750g in fed ponds or cages.

Shape: Wide, long and narrow (looks big when placed side down). Chitralada
Fillet yield: Found to have highest yield of all strains under high density tank culture in Holland.
Colour: 

Natural Nile tilapia colouration, becomes lighter or darker to camouflage the fish against the background.

Maturity:      6 months.  
Egg yield: 30-50 eggs/m2/day in spawning hapas  
Disease resistance: Moderate  
     
GIFT  : Presently the most widely cultured strain of Nile tilapia in Thailand.
Origin:

The Genetically Improved Farmed Tilapia or GIFT strain was produced by the International Centre for Living Aquatic Resources Management (ICLARM, based in Philippines) from a wide genetic base of wild and farmed strains.  Nam Sai acquired GIFT generation 5 in 1997 and generation 9 in 2000 from the Thai National Aquatic Genetics Research Institute (NAGRI).  Nam Sai has now merged both generations into a single strain.

Growth:

Similar to Chitralada

 
Shape: Short and fat, stocky body (wide girth makes it appealing when sold live). GIFT
Fillet yield: Despite being fat, fillet yield is lower than Chitralada possibly due to having a large body cavity.
Colour: 

Natural Nile tilapia colouration.

Maturity:      7 months.  
Egg yield: 30-50 eggs/m2/day in spawning hapas  
Disease resistance: High  
     
Big Nin : A new faster growing strain of Nile tilapia.

Origin:

Reported to be developed from the GIFT strain and acquired by Nam Sai in 2004 from a hatchery in the Philippines.

Growth:

In 6 months (from 0.2g) attains 450g in fertilized ponds and 800g in fed ponds or cages.

Shape: Short and fat with a wide girth.  
Fillet yield: Similar to GIFT. Big Nin
Colour:  Natural Nile tilapia colouration.
Maturity:

6 months

Egg yield: 30-50 eggs/m2/day in spawning hapas  
Disease resistance: Moderate and higher than pure strains. Good resistance to Streptococcus agalactiae.  
     
Nam Sai 2  : An F1 hybrid with plenty of vigour.
Origin:

This is an F1 hybrid and not a pure strain.  It is created by crossing GIFT (high disease-resistance) and Big Nin (grows fast to a large size).

Growth:

Very fast all the way.  In 6 months (from 0.2g) attains 430g in fertilized ponds and 780g in fed ponds or cages.

Shape:

Short and fat with a wide girth

Nam Sai 2
Fillet yield:

Similar to GIFT

Colour: 

Natural Nile tilapia colouration.

Maturity:     Not used for breeding.  
Disease resistance: Moderate to high